Professor in atomic physics at the Department of Physics at Stockholm University

Telephone: +46-8-5537-8626

Mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

My recent publications:

  1. Fredrik Linden, Henrik Cederquist and Henning Zettergren.
    Interaction and charge transfer between dielectric spheres: Exact and approximate analytical solutions. The Journal of Chemical Physics 145(19):, 2016.
    URL, DOI BibTeX

    @article{:/content/aip/journal/jcp/145/19/10.1063/1.4967701,
    	author = "Linden, Fredrik and Cederquist, Henrik and Zettergren, Henning",
    	title = "Interaction and charge transfer between dielectric spheres: Exact and approximate analytical solutions",
    	journal = "The Journal of Chemical Physics",
    	year = 2016,
    	volume = 145,
    	number = 19,
    	eid = 194307,
    	pages = "",
    	url = "http://scitation.aip.org/content/aip/journal/jcp/145/19/10.1063/1.4967701",
    	doi = "http://dx.doi.org/10.1063/1.4967701"
    }
    
  2. K C Chartkunchand, M Kamiıfmmode \acuten\else ń\fiska, E K Anderson, M K Kristiansson, G Eklund, O M Hole, R F Nascimento, M Blom, M Björkhage, A Källberg, P Löfgren, P Reinhed, S Rosén, A Simonsson, R D Thomas, S Mannervik, V T Davis, P A Neill, J S Thompson, D Hanstorp, H Zettergren, H Cederquist and H T Schmidt.
    Radiative lifetimes of the bound excited states of Pt^-. Phys. Rev. A 94:032501, September 2016.
    URL, DOI BibTeX

    @article{PhysRevA.94.032501,
    	title = "Radiative lifetimes of the bound excited states of Pt^-",
    	author = {Chartkunchand, K. C. and Kami\ifmmode \acute{n}\else \'{n}\fi{}ska, M. and Anderson, E. K. and Kristiansson, M. K. and Eklund, G. and Hole, O. M. and Nascimento, R. F. and Blom, M. and Bj\"orkhage, M. and K\"allberg, A. and L\"ofgren, P. and Reinhed, P. and Ros\'en, S. and Simonsson, A. and Thomas, R. D. and Mannervik, S. and Davis, V. T. and Neill, P. A. and Thompson, J. S. and Hanstorp, D. and Zettergren, H. and Cederquist, H. and Schmidt, H. T.},
    	journal = "Phys. Rev. A",
    	volume = 94,
    	issue = 3,
    	pages = 032501,
    	numpages = 6,
    	year = 2016,
    	month = "Sep",
    	publisher = "American Physical Society",
    	doi = "10.1103/PhysRevA.94.032501",
    	url = "http://link.aps.org/doi/10.1103/PhysRevA.94.032501"
    }
    
  3. Michael Wolf, Linda Giacomozzi, Michael Gatchell, Nathalie Ruette, Mark H Stockett, Henning T Schmidt, Henrik Cederquist and Henning Zettergren.
    Hydrogenated pyrene: Statistical single-carbon loss below the knockout threshold. EUROPEAN PHYSICAL JOURNAL D 70(4), 2016.
    DOI BibTeX

    @article{ ISI:000375296200002,
    	author = "Wolf, Michael and Giacomozzi, Linda and Gatchell, Michael and de Ruette, Nathalie and Stockett, Mark H. and Schmidt, Henning T. and Cederquist, Henrik and Zettergren, Henning",
    	title = "{Hydrogenated pyrene: Statistical single-carbon loss below the knockout threshold}",
    	journal = "{EUROPEAN PHYSICAL JOURNAL D}",
    	year = "{2016}",
    	volume = "{70}",
    	number = "{4}",
    	month = "{APR 14}",
    	doi = "{10.1140/epjd/e2016-60735-3}",
    	article-number = "{85}",
    	issn = "{1434-6060}",
    	eissn = "{1434-6079}",
    	researcherid-numbers = "{Schmidt, Henning/H-6277-2016}",
    	unique-id = "{ISI:000375296200002}"
    }
    
  4. M H Stockett, M Gatchell, N Ruette, L Giacomozzi, T Chen, P Rousseau, S Maclot, J -Y Chesnel, L Adoui, B A Huber, U Bērziņš, H T Schmidt, H Zettergren and H Cederquist.
    Isomer effects in fragmentation of Polycyclic Aromatic Hydrocarbons. International Journal of Mass Spectrometry 392():58, 2015.
    URL, DOI BibTeX

    @article{Stockett2015,
    	title = "Isomer effects in fragmentation of Polycyclic Aromatic Hydrocarbons",
    	journal = "International Journal of Mass Spectrometry",
    	volume = 392,
    	number = "",
    	pages = 58,
    	year = 2015,
    	note = "",
    	issn = "1387-3806",
    	doi = "http://dx.doi.org/10.1016/j.ijms.2015.09.005",
    	url = "http://www.sciencedirect.com/science/article/pii/S1387380615003140",
    	author = "M.H. Stockett and M. Gatchell and N. de Ruette and L. Giacomozzi and T. Chen and P. Rousseau and S. Maclot and J.-Y. Chesnel and L. Adoui and B.A. Huber and U. Bērziņš and H.T. Schmidt and H. Zettergren and H. Cederquist",
    	keywords = "Non-statistical fragmentation"
    }
    
  5. M H Stockett, M Gatchell, T Chen, N Ruette, L Giacomozzi, M Wolf, H T Schmidt, H Zettergren and H Cederquist.
    Threshold Energies for Single-Carbon Knockout from Polycyclic Aromatic Hydrocarbons. The Journal of Physical Chemistry Letters 6(22):4504-4509, 2015.
    URL, DOI BibTeX

    @article{doi:10.1021/acs.jpclett.5b02080,
    	author = "M. H. Stockett and M. Gatchell and T. Chen and N. de Ruette and L. Giacomozzi and M. Wolf and H. T. Schmidt and H. Zettergren and H. Cederquist",
    	title = "Threshold Energies for Single-Carbon Knockout from Polycyclic Aromatic Hydrocarbons",
    	journal = "The Journal of Physical Chemistry Letters",
    	volume = 6,
    	number = 22,
    	pages = "4504-4509",
    	year = 2015,
    	doi = "10.1021/acs.jpclett.5b02080",
    	note = "PMID: 26523738",
    	url = "http://dx.doi.org/10.1021/acs.jpclett.5b02080"
    }
    
  6. M Gatchell, M H Stockett, N Ruette, T Chen, L Giacomozzi, R F Nascimento, M Wolf, E K Anderson, R Delaunay, V Vizcaino, P Rousseau, L Adoui, B A Huber, H T Schmidt, H Zettergren and H Cederquist.
    Failure of hydrogenation in protecting polycyclic aromatic hydrocarbons from fragmentation. Phys. Rev. A 92:050702(R), November 2015.
    URL, DOI BibTeX

    @article{PhysRevA.92.050702,
    	title = "Failure of hydrogenation in protecting polycyclic aromatic hydrocarbons from fragmentation",
    	author = "Gatchell, M. and Stockett, M. H. and de Ruette, N. and Chen, T. and Giacomozzi, L. and Nascimento, R. F. and Wolf, M. and Anderson, E. K. and Delaunay, R. and Vizcaino, V. and Rousseau, P. and Adoui, L. and Huber, B. A. and Schmidt, H. T. and Zettergren, H. and Cederquist, H.",
    	journal = "Phys. Rev. A",
    	volume = 92,
    	issue = 5,
    	pages = "050702(R)",
    	numpages = 5,
    	year = 2015,
    	month = "Nov",
    	publisher = "American Physical Society",
    	doi = "10.1103/PhysRevA.92.050702",
    	url = "http://link.aps.org/doi/10.1103/PhysRevA.92.050702"
    }
    
  7. Kostiantyn Kulyk, Oleksii Rebrov, Mark H Stockett, John D Alexander, Henning Zettergren, Henning T Schmidt, Richard D Thomas, Henrik Cederquist and Mats Larsson.
    High-energy collisions of protonated enantiopure amino acids with a chiral target gas. International Journal of Mass Spectrometry 388():59 - 64, 2015.
    URL, DOI BibTeX

    @article{Kulyk201559,
    	title = "High-energy collisions of protonated enantiopure amino acids with a chiral target gas",
    	journal = "International Journal of Mass Spectrometry",
    	volume = 388,
    	number = "",
    	pages = "59 - 64",
    	year = 2015,
    	note = "",
    	issn = "1387-3806",
    	doi = "http://dx.doi.org/10.1016/j.ijms.2015.08.010",
    	url = "http://www.sciencedirect.com/science/article/pii/S1387380615002614",
    	author = "Kostiantyn Kulyk and Oleksii Rebrov and Mark H. Stockett and John D. Alexander and Henning Zettergren and Henning T. Schmidt and Richard D. Thomas and Henrik Cederquist and Mats Larsson",
    	keywords = "2-Butanol"
    }
    
  8. Rudy Delaunay, Michael Gatchell, Patrick Rousseau, Alicja Domaracka, Sylvain Maclot, Yang Wang, Mark H Stockett, Tao Chen, Lamri Adoui, Manuel Alcami, Fernando Martin, Henning Zettergren, Henrik Cederquist and Bernd A Huber.
    Molecular Growth Inside of Polycyclic Aromatic Hydrocarbon Clusters Induced by Ion Collisions. JOURNAL OF PHYSICAL CHEMISTRY LETTERS 6(9):1536-1542, 2015.
    DOI BibTeX

    @article{ ISI:000355014900006,
    	author = "Delaunay, Rudy and Gatchell, Michael and Rousseau, Patrick and Domaracka, Alicja and Maclot, Sylvain and Wang, Yang and Stockett, Mark H. and Chen, Tao and Adoui, Lamri and Alcami, Manuel and Martin, Fernando and Zettergren, Henning and Cederquist, Henrik and Huber, Bernd A.",
    	title = "{Molecular Growth Inside of Polycyclic Aromatic Hydrocarbon Clusters Induced by Ion Collisions}",
    	journal = "{JOURNAL OF PHYSICAL CHEMISTRY LETTERS}",
    	year = "{2015}",
    	volume = "{6}",
    	number = "{9}",
    	pages = "{1536-1542}",
    	month = "{MAY 7}",
    	doi = "{10.1021/acs.jpclett.5b00405}",
    	issn = "{1948-7185}",
    	researcherid-numbers = "{Wang, Yang/A-2602-2015 Gatchell, Michael/O-2335-2015 Maclot, Sylvain /O-3225-2015}",
    	orcid-numbers = "{Wang, Yang/0000-0003-2540-2199 Maclot, Sylvain /0000-0001-5587-7182}",
    	unique-id = "{ISI:000355014900006}"
    }
    
  9. T Chen, M Gatchell, M H Stockett, R Delaunay, A Domaracka, E R Micelotta, A G G M Tielens, P Rousseau, L Adoui, B A Huber, H T Schmidt, H Cederquist and H Zettergren.
    Formation of H2 from internally heated polycyclic aromatic hydrocarbons: Excitation energy dependence. The Journal of Chemical Physics 142:144305, 2015.
    URL, DOI BibTeX

    @article{:/content/aip/journal/jcp/142/14/10.1063/1.4917021,
    	author = "Chen, T. and Gatchell, M. and Stockett, M. H. and Delaunay, R. and Domaracka, A. and Micelotta, E. R. and Tielens, A. G. G. M. and Rousseau, P. and Adoui, L. and Huber, B. A. and Schmidt, H. T. and Cederquist, H. and Zettergren, H.",
    	title = "Formation of H2 from internally heated polycyclic aromatic hydrocarbons: Excitation energy dependence",
    	journal = "The Journal of Chemical Physics",
    	year = 2015,
    	volume = 142,
    	pages = 144305,
    	url = "http://scitation.aip.org/content/aip/journal/jcp/142/14/10.1063/1.4917021",
    	doi = "http://dx.doi.org/10.1063/1.4917021"
    }
    
  10. E Bäckström, D Hanstorp, O M Hole, M Kaminska, R F Nascimento, M Blom, M Björkhage, A Källberg, P Löfgren, P Reinhed, S Rosén, A Simonsson, R D Thomas, S Mannervik, H T Schmidt and H Cederquist.
    Storing keV Negative Ions for an Hour: The Lifetime of the Metastable ${^2P}_1/2^o$ level in ${^32\mathrmS}^-$. Phys. Rev. Lett. 114:143003, April 2015.
    URL, DOI BibTeX

    @article{PhysRevLett.114.143003,
    	title = "Storing keV Negative Ions for an Hour: The Lifetime of the Metastable ${^{2}P}_{1/2}^{o}$ level in ${^{32}\mathrm{S}}^{-}$",
    	author = {B\"ackstr\"om, E. and Hanstorp, D. and Hole, O. M. and Kaminska, M. and Nascimento, R. F. and Blom, M. and Bj\"orkhage, M. and K\"allberg, A. and L\"ofgren, P. and Reinhed, P. and Ros\'en, S. and Simonsson, A. and Thomas, R. D. and Mannervik, S. and Schmidt, H. T. and Cederquist, H.},
    	journal = "Phys. Rev. Lett.",
    	volume = 114,
    	issue = 14,
    	pages = 143003,
    	numpages = 5,
    	year = 2015,
    	month = "Apr",
    	publisher = "American Physical Society",
    	doi = "10.1103/PhysRevLett.114.143003",
    	url = "http://link.aps.org/doi/10.1103/PhysRevLett.114.143003"
    }
    
  11. M H Stockett, M Gatchell, J D Alexander, U Berzins, T Chen, K Farid, A Johansson, K Kulyk, P Rousseau, K Stochkel, L Adoui, P Hvelplund, B A Huber, H T Schmidt, H Zettergren and H Cederquist.
    Fragmentation of anthracene C14H10, acridine C13H9N and phenazine C12H8N2 ions in collisions with atoms. Phys. Chem. Chem. Phys. 16:21980, 2014.
    URL, DOI BibTeX

    @article{C4CP03293D,
    	author = "Stockett, M. H. and Gatchell, M. and Alexander, J. D. and Berzins, U. and Chen, T. and Farid, K. and Johansson, A. and Kulyk, K. and Rousseau, P. and Stochkel, K. and Adoui, L. and Hvelplund, P. and Huber, B. A. and Schmidt, H. T. and Zettergren, H. and Cederquist, H.",
    	doi = "10.1039/C4CP03293D",
    	journal = "Phys. Chem. Chem. Phys.",
    	volume = 16,
    	issue = 40,
    	pages = 21980,
    	publisher = "The Royal Society of Chemistry",
    	title = "Fragmentation of anthracene C14H10{,} acridine C13H9N and phenazine C12H8N2 ions in collisions with atoms",
    	url = "http://dx.doi.org/10.1039/C4CP03293D",
    	year = 2014,
    	bdsk-url-1 = "http://dx.doi.org/10.1039/C4CP03293D"
    }
    
  12. Humberto Silva, Javier Oller, Michael Gatchell, Mark H Stockett, Paul-Antoine Hervieux, Lamri Adoui, Manuel Alcamí, Bernd A Huber, Fernando Martín, Henrik Cederquist, Henning Zettergren, Patrick Rousseau and Sergio Díaz-Tendero.
    Multiple electron capture, excitation, and fragmentation in C6+ + C60 collisions. Phys. Rev. A 90:032701, 2014.
    URL, DOI BibTeX

    @article{PhysRevA.90.032701,
    	title = "Multiple electron capture, excitation, and fragmentation in C6+ + C60 collisions",
    	author = "da Silva, Humberto and Oller, Javier and Gatchell, Michael and Stockett, Mark H. and Hervieux, Paul-Antoine and Adoui, Lamri and Alcam\'i, Manuel and Huber, Bernd A. and Mart\'in, Fernando and Cederquist, Henrik and Zettergren, Henning and Rousseau, Patrick and D\'iaz-Tendero, Sergio",
    	journal = "Phys. Rev. A",
    	volume = 90,
    	issue = 3,
    	pages = 032701,
    	numpages = 11,
    	year = 2014,
    	publisher = "American Physical Society",
    	doi = "10.1103/PhysRevA.90.032701",
    	url = "http://link.aps.org/doi/10.1103/PhysRevA.90.032701"
    }
    
  13. M Gatchell, P Rousseau, A Domaracka, M H Stockett, T Chen, H T Schmidt, J Y Chesnel, A Méry, S Maclot, L Adoui, B A Huber, H Zettergren and H Cederquist.
    Ions colliding with mixed clusters of C60 and coronene: Fragmentation and bond formation. Phys. Rev. A 90:022713, 2014.
    URL, DOI BibTeX

    @article{PhysRevA.90.022713,
    	title = "Ions colliding with mixed clusters of C60 and coronene: Fragmentation and bond formation",
    	author = "Gatchell, M. and Rousseau, P. and Domaracka, A. and Stockett, M. H. and Chen, T. and Schmidt, H. T. and Chesnel, J. Y. and M\'ery, A. and Maclot, S. and Adoui, L. and Huber, B. A. and Zettergren, H. and Cederquist, H.",
    	journal = "Phys. Rev. A",
    	volume = 90,
    	issue = 2,
    	pages = 022713,
    	numpages = 7,
    	year = 2014,
    	publisher = "American Physical Society",
    	doi = "10.1103/PhysRevA.90.022713",
    	url = "http://link.aps.org/doi/10.1103/PhysRevA.90.022713"
    }
    
  14. Henning Zettergren, Fredrik Linden and Henrik Cederquist.
    Comment on "Surface-charge distribution on a dielectric sphere due to an external point charge: examples of C60 and C240 fullerenes, Phys. Chem. Chem. Phys., 2013, 15, 20115". Phys. Chem. Chem. Phys., pages -, 2014.
    URL, DOI BibTeX

    @article{C4CP02036G,
    	author = "Zettergren, Henning and Linden, Fredrik and Cederquist, Henrik",
    	doi = "10.1039/C4CP02036G",
    	journal = "Phys. Chem. Chem. Phys.",
    	pages = "-",
    	publisher = "The Royal Society of Chemistry",
    	title = {Comment on {"}Surface-charge distribution on a dielectric sphere due to an external point charge: examples of C60 and C240 fullerenes{,} Phys. Chem. Chem. Phys.{,} 2013{,} 15{,} 20115{"}},
    	url = "http://dx.doi.org/10.1039/C4CP02036G",
    	year = 2014,
    	bdsk-url-1 = "http://dx.doi.org/10.1039/C4CP02036G"
    }
    
  15. Y Wang, H Zettergren, P Rousseau, T Chen, M Gatchell, M H Stockett, A Domaracka, L Adoui, B A Huber, H Cederquist, M Alcamí and F Martín.
    Formation dynamics of fullerene dimers $C_118^+$, $C_119^+$, and $C_120^+$. Phys. Rev. A 89:062708, June 2014.
    URL, DOI BibTeX

    @article{PhysRevA.89.062708,
    	title = "Formation dynamics of fullerene dimers ${C}_{118}^{+}$, ${C}_{119}^{+}$, and ${C}_{120}^{+}$",
    	author = "Wang, Y. and Zettergren, H. and Rousseau, P. and Chen, T. and Gatchell, M. and Stockett, M. H. and Domaracka, A. and Adoui, L. and Huber, B. A. and Cederquist, H. and Alcam{\'i}, M. and Mart{\'i}n, F.",
    	journal = "Phys. Rev. A",
    	volume = 89,
    	issue = 6,
    	pages = 062708,
    	numpages = 12,
    	year = 2014,
    	month = "Jun",
    	publisher = "American Physical Society",
    	doi = "10.1103/PhysRevA.89.062708",
    	url = "http://link.aps.org/doi/10.1103/PhysRevA.89.062708"
    }
    
  16. T Chen, M Gatchell, M H Stockett, J D Alexander, Y Zhang, P Rousseau, A Domaracka, S Maclot, R Delaunay, L Adoui, B A Huber, T Schlathölter, H T Schmidt, H Cederquist and H Zettergren.
    Absolute fragmentation cross sections in atom-molecule collisions: Scaling laws for non-statistical fragmentation of polycyclic aromatic hydrocarbon molecules. The Journal of Chemical Physics 140(22):224306, 2014.
    URL, DOI BibTeX

    @article{:/content/aip/journal/jcp/140/22/10.1063/1.4881603,
    	author = {Chen, T. and Gatchell, M. and Stockett, M. H. and Alexander, J. D. and Zhang, Y. and Rousseau, P. and Domaracka, A. and Maclot, S. and Delaunay, R. and Adoui, L. and Huber, B. A. and Schlath{\"o}lter, T. and Schmidt, H. T. and Cederquist, H. and Zettergren, H.},
    	doi = "http://dx.doi.org/10.1063/1.4881603",
    	eid = 224306,
    	journal = "The Journal of Chemical Physics",
    	number = 22,
    	pages = 224306,
    	title = "Absolute fragmentation cross sections in atom-molecule collisions: Scaling laws for non-statistical fragmentation of polycyclic aromatic hydrocarbon molecules",
    	url = "http://scitation.aip.org/content/aip/journal/jcp/140/22/10.1063/1.4881603",
    	volume = 140,
    	year = 2014,
    	bdsk-url-1 = "http://scitation.aip.org/content/aip/journal/jcp/140/22/10.1063/1.4881603",
    	bdsk-url-2 = "http://dx.doi.org/10.1063/1.4881603"
    }
    
  17. M Gatchell, M H Stockett, P Rousseau, T Chen, K Kulyk, H T Schmidt, J Y Chesnel, A Domaracka, A Méry, S Maclot, L Adoui, K Støchkel, P Hvelplund, Y Wang, M Alcamí, B A Huber, F Martín, H Zettergren and H Cederquist.
    Non-statistical fragmentation of PAHs and fullerenes in collisions with atoms. International Journal of Mass Spectrometry 365–366(0):260 - 265, 2014.
    URL, DOI BibTeX

    @article{Gatchell2014260,
    	author = "M. Gatchell and M.H. Stockett and P. Rousseau and T. Chen and K. Kulyk and H.T. Schmidt and J.Y. Chesnel and A. Domaracka and A. M{\'e}ry and S. Maclot and L. Adoui and K. St{\o}chkel and P. Hvelplund and Y. Wang and M. Alcam{\'i} and B.A. Huber and F. Mart{\'i}n and H. Zettergren and H. Cederquist",
    	doi = "http://dx.doi.org/10.1016/j.ijms.2013.12.013",
    	issn = "1387-3806",
    	journal = "International Journal of Mass Spectrometry",
    	keywords = "Non-statistical fragmentation",
    	note = "Special issue: Tilmann mark",
    	number = 0,
    	pages = "260 - 265",
    	title = "Non-statistical fragmentation of \{PAHs\} and fullerenes in collisions with atoms",
    	url = "http://www.sciencedirect.com/science/article/pii/S1387380613004491",
    	volume = "365--366",
    	year = 2014,
    	bdsk-url-1 = "http://www.sciencedirect.com/science/article/pii/S1387380613004491",
    	bdsk-url-2 = "http://dx.doi.org/10.1016/j.ijms.2013.12.013"
    }
    
  18. M H Stockett, H Zettergren, L Adoui, J D Alexander, U Berzins, T Chen, M Gatchell, N Haag, B A Huber, P Hvelplund, A Johansson, H A B Johansson, K Kulyk, S Rosen, P Rousseau, K Stochkel, H T Schmidt and H Cederquist.
    Nonstatistical fragmentation of large molecules. PHYSICAL REVIEW A 89(3), 2014.
    DOI BibTeX

    @article{ISI:000332340800004,
    	article-number = "{032701}",
    	author = "Stockett, M. H. and Zettergren, H. and Adoui, L. and Alexander, J. D. and Berzins, U. and Chen, T. and Gatchell, M. and Haag, N. and Huber, B. A. and Hvelplund, P. and Johansson, A. and Johansson, H. A. B. and Kulyk, K. and Rosen, S. and Rousseau, P. and Stochkel, K. and Schmidt, H. T. and Cederquist, H.",
    	doi = "{10.1103/PhysRevA.89.032701}",
    	eissn = "{1094-1622}",
    	issn = "{1050-2947}",
    	journal = "{PHYSICAL REVIEW A}",
    	month = "{MAR 6}",
    	number = "{3}",
    	title = "{Nonstatistical fragmentation of large molecules}",
    	unique-id = "{ISI:000332340800004}",
    	volume = "{89}",
    	year = "{2014}",
    	bdsk-url-1 = "http://dx.doi.org/10.1103/PhysRevA.89.032701%7D"
    }
    
  19. F Seitz, H Zettergren, P Rousseau, Y Wang, T Chen, M Gatchell, J D Alexander, M H Stockett, J Rangama, J Y Chesnel, M Capron, J C Poully, A Domaracka, A Mery, S Maclot, V Vizcaino, H T Schmidt, L Adoui, M Alcami, A G G M Tielens, F Martin, B A Huber and H Cederquist.
    Ions colliding with clusters of fullerenes–-Decay pathways and covalent bond formations. The Journal of Chemical Physics 139(3):034309, 2013.
    URL, DOI BibTeX

    @article{seitz:034309,
    	author = "F. Seitz and H. Zettergren and P. Rousseau and Y. Wang and T. Chen and M. Gatchell and J. D. Alexander and M. H. Stockett and J. Rangama and J. Y. Chesnel and M. Capron and J. C. Poully and A. Domaracka and A. Mery and S. Maclot and V. Vizcaino and H. T. Schmidt and L. Adoui and M. Alcami and A. G. G. M. Tielens and F. Martin and B. A. Huber and H. Cederquist",
    	collaboration = "",
    	title = "Ions colliding with clusters of fullerenes---Decay pathways and covalent bond formations",
    	publisher = "AIP",
    	year = 2013,
    	journal = "The Journal of Chemical Physics",
    	volume = 139,
    	number = 3,
    	eid = 034309,
    	numpages = 8,
    	pages = 034309,
    	keywords = "argon; bonds (chemical); charge exchange; evaporation; excited states; fullerenes; helium ions; ionisation; ion-molecule collisions; ion-molecule reactions; molecular clusters; molecular dynamics method; Monte Carlo methods; positive ions; van der Waals forces; xenon",
    	url = "/images/articles/Cov_bond_form_JCP.html",
    	doi = "10.1063/1.4812790"
    }
    
  20. H T Schmidt, R D Thomas, M Gatchell, S Rosén, P Reinhed, P Löfgren, L Brännholm, M Blom, M Björkhage, E Bäckström, J D Alexander, S Leontein, D Hanstorp, H Zettergren, L Liljeby, A Källberg, A Simonsson, F Hellberg, S Mannervik, M Larsson, W D Geppert, K G Rensfelt, H Danared, A Paál, M Masuda, P Halldén, G Andler, M H Stockett, T Chen, G Källersjö, J Weimer, K Hansen, H Hartman and H Cederquist.
    First storage of ion beams in the Double Electrostatic Ion-Ring Experiment: DESIREE. Review of Scientific Instruments 84(5):055115, 2013.
    URL, DOI BibTeX

    @article{schmidt:055115,
    	author = {H. T. Schmidt and R. D. Thomas and M. Gatchell and S. Ros\'{e}n and P. Reinhed and P. L\"{o}fgren and L. Br\"{a}nnholm and M. Blom and M. Bj\"{o}rkhage and E. B\"{a}ckstr\"{o}m and J. D. Alexander and S. Leontein and D. Hanstorp and H. Zettergren and L. Liljeby and A. K\"{a}llberg and A. Simonsson and F. Hellberg and S. Mannervik and M. Larsson and W. D. Geppert and K. G. Rensfelt and H. Danared and A. Pa\'{a}l and M. Masuda and P. Halld\'{e}n and G. Andler and M. H. Stockett and T. Chen and G. K\"{a}llersj\"{o} and J. Weimer and K. Hansen and H. Hartman and H. Cederquist},
    	collaboration = "",
    	title = "First storage of ion beams in the Double Electrostatic Ion-Ring Experiment: DESIREE",
    	publisher = "AIP",
    	year = 2013,
    	journal = "Review of Scientific Instruments",
    	volume = 84,
    	number = 5,
    	eid = 055115,
    	numpages = 6,
    	pages = 055115,
    	keywords = "ion accelerators; ion beams; particle beam injection; space charge; storage rings",
    	url = "/images/articles/DESIREE_Comm_RSI.html",
    	doi = "10.1063/1.4807702"
    }
    
  21. H Zettergren, P Rousseau, Y Wang, F Seitz, T Chen, M Gatchell, J D Alexander, M H Stockett, J Rangama, J Y Chesnel, M Capron, J C Poully, A Domaracka, A Mery, S Maclot, H T Schmidt, L Adoui, M Alcami, A G G M Tielens, F Martin, B A Huber and H Cederquist.
    Formations of Dumbbell C118 and C119 inside Clusters of C60 Molecules by Collision with alpha Particles. Phys. Rev. Lett. 110:185501, May 2013.
    URL, DOI BibTeX

    @article{PhysRevLett.110.185501,
    	title = "Formations of Dumbbell C118 and C119 inside Clusters of C60 Molecules by Collision with alpha Particles",
    	author = "Zettergren, H. and Rousseau, P. and Wang, Y. and Seitz, F. and Chen, T. and Gatchell, M. and Alexander, J. D. and Stockett, M. H. and Rangama, J. and Chesnel, J. Y. and Capron, M. and Poully, J. C. and Domaracka, A. and Mery, A. and Maclot, S. and Schmidt, H. T. and Adoui, L. and Alcami, M. and Tielens, A. G. G. M. and Martin, F. and Huber, B. A. and Cederquist, H.",
    	journal = "Phys. Rev. Lett.",
    	volume = 110,
    	issue = 18,
    	pages = 185501,
    	numpages = 5,
    	year = 2013,
    	month = "May",
    	doi = "10.1103/PhysRevLett.110.185501",
    	url = "http://link.aps.org/doi/10.1103/PhysRevLett.110.185501",
    	publisher = "American Physical Society"
    }
    
  22. B O Forsberg, J D Alexander, T Chen, A T Pettersson, M Gatchell, H Cederquist and H Zettergren.
    Ions interacting with planar aromatic molecules: Modeling electron transfer reactions. JOURNAL OF CHEMICAL PHYSICS 138(5), 2013.
    DOI BibTeX

    @article{ ISI:000314746400029,
    	author = "Forsberg, B. O. and Alexander, J. D. and Chen, T. and Pettersson, A. T. and Gatchell, M. and Cederquist, H. and Zettergren, H.",
    	title = "{Ions interacting with planar aromatic molecules: Modeling electron transfer reactions}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2013}",
    	volume = "{138}",
    	number = "{5}",
    	month = "{FEB 7}",
    	abstract = "{We present theoretical absolute charge exchange cross sections for multiply charged cations interacting with the Polycyclic Aromatic Hydrocarbon (PAH) molecules pyrene C14H10, coronene C24H12, or circumcoronene C54H18. These planar, nearly circular, PAHs are modelled as conducting, infinitely thin, and perfectly circular discs, which are randomly oriented with respect to straight line ion trajectories. We present the analytical solution for the potential energy surface experienced by an electron in the field of such a charged disc and a point-charge at an arbitrary position. The location and height of the corresponding potential energy barrier from this simple model are in close agreement with those from much more computationally demanding Density Functional Theory (DFT) calculations in a number of test cases. The model results compare favourably with available experimental data on single-and multiple electron transfer reactions and we demonstrate that it is important to include the orientation dependent polarizabilities of the molecules (model discs) in particular for the larger PAHs. PAH ionization energy sequences from DFT are tabulated and used as model inputs. Absolute cross sections for the ionization of PAH molecules, and PAH ionization energies such as the ones presented here may be useful when considering the roles of PAHs and their ions in, e. g., interstellar chemistry, stellar atmospheres, and in related photoabsorption and photoemission spectroscopies. (C) 2013 American Institute of Physics. {[}http://dx.doi.org/10.1063/1.4790164]}",
    	doi = "{10.1063/1.4790164}",
    	article-number = "{054306}",
    	issn = "{0021-9606}",
    	unique-id = "{ISI:000314746400029}"
    }
    
  23. P Rousseau, A Lawicki, A I S Holm, M Capron, R Maisonny, S Maclot, E Lattouf, H A B Johansson, F Seitz, A Mery, J Rangama, H Zettergren, S Rosen, H T Schmidt, J -Y Chesnel, A Domaracka, B Manil, L Adoui, H Cederquist and B A Huber.
    Low-energy ions interacting with anthracene molecules and clusters. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 279:140-143, 2012.
    DOI BibTeX

    @article{ ISI:000303637500033,
    	author = "Rousseau, P. and Lawicki, A. and Holm, A. I. S. and Capron, M. and Maisonny, R. and Maclot, S. and Lattouf, E. and Johansson, H. A. B. and Seitz, F. and Mery, A. and Rangama, J. and Zettergren, H. and Rosen, S. and Schmidt, H. T. and Chesnel, J. -Y. and Domaracka, A. and Manil, B. and Adoui, L. and Cederquist, H. and Huber, B. A.",
    	title = "{Low-energy ions interacting with anthracene molecules and clusters}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{2012}",
    	volume = "{279}",
    	pages = "{140-143}",
    	month = "{MAY 15}",
    	note = "{5th International Conference on Elementary Processes in Atomic Systems (CEPAS), Belgrade, SERBIA, JUN 21-25, 2011}",
    	organization = "{Univ Belgrade, Inst Phys; Serbian Acad Sci \& Arts (SASA); Republ Serbia, Minist Educ \& Sci; Serbian Phys Soc; Serv Cooperat dact culturelle Ambassade France Serbie; Osterreichisches Kulturforum Belgrad}",
    	abstract = "{The interaction of slow ions (nu similar to 0.4 au.) with a small polycyclic aromatic hydrocarbon, namely anthracene (C14H10), is studied in the gas-phase either with the isolated molecule or with a pure cluster target. We discuss the ionization and fragmentation of the molecule with respect to the projectile charge state, i.e. for singly charged He+ ions and for multiply charged Xe20+. ions. For the isolated C14H10, single or multiple ionization of the molecule occurs under ion impact. The (multi) cation relative yields are compared with those obtained by other ionization methods (electron and fs-laser). The molecular dissociation occurs by loss of hydrogen and small hydrocarbon molecules, leading to the formation of CnHx cations. The interaction of Xe20+ with C14H10 clusters gives surprising results, i.e. the emission of hotter monomer compared to the interaction with He+. (C) 2011 Elsevier B.V. All rights reserved.}",
    	doi = "{10.1016/j.nimb.2011.10.050}",
    	issn = "{0168-583X}",
    	researcherid-numbers = "{Lawicki, Arkadiusz/G-2541-2011}",
    	unique-id = "{ISI:000303637500033}"
    }
    
  24. Henning Zettergren and Henrik Cederquist.
    {Comment on “Treating highly charged carbon and fullerene clusters as dielectric particles” by A. J. Stace and E. Bichoutskaia, Phys. Chem. Chem. Phys., 2011, 13, 18339}. PHYSICAL CHEMISTRY CHEMICAL PHYSICS 14(48):16770, 2012.
    DOI BibTeX

    @article{ ISI:000311735700033,
    	author = "Zettergren, Henning and Cederquist, Henrik",
    	title = "{Comment on ``Treating highly charged carbon and fullerene clusters as dielectric particles{''} by A. J. Stace and E. Bichoutskaia, Phys. Chem. Chem. Phys., 2011, 13, 18339}",
    	journal = "{PHYSICAL CHEMISTRY CHEMICAL PHYSICS}",
    	year = "{2012}",
    	volume = "{14}",
    	number = "{48}",
    	pages = "{16770}",
    	doi = "{10.1039/c2cp42883k}",
    	issn = "{1463-9076}",
    	unique-id = "{ISI:000311735700033}"
    }
    
  25. Henning Zettergren, Bjorn O Forsberg and Henrik Cederquist.
    Are single C-60 fullerenes dielectric or metallic?. PHYSICAL CHEMISTRY CHEMICAL PHYSICS 14(47):16360-16364, 2012.
    DOI BibTeX

    @article{ ISI:000311161700024,
    	author = "Zettergren, Henning and Forsberg, Bjorn O. and Cederquist, Henrik",
    	title = "{Are single C-60 fullerenes dielectric or metallic?}",
    	journal = "{PHYSICAL CHEMISTRY CHEMICAL PHYSICS}",
    	year = "{2012}",
    	volume = "{14}",
    	number = "{47}",
    	pages = "{16360-16364}",
    	abstract = "{We present analytical solutions for the interaction energies between a static point charge and a metal- or a dielectric sphere. These solutions include polarization effects to infinite orders in the inverse of the distance between the point charge and the spheres. Further, we present Density Functional Theory (DFT) calculations of interaction energies for a point charge in ranges of fixed positions outside a neutral or a singly charged C-60 molecule. Based on these DFT results, we conclude that the metal sphere model describes the electronic response of the C60 molecule much better than the dielectric sphere model. These findings are particularly important for calculations of energy barriers for charge transfer in reactions involving C60 molecules. The metal- and dielectric models should further be useful for descriptions of, for example, the polarizabilities of and interactions with conducting and insulating spherical clusters or particles.}",
    	doi = "{10.1039/c2cp42884a}",
    	issn = "{1463-9076}",
    	researcherid-numbers = "{Forsberg, Bjorn/K-4789-2012}",
    	unique-id = "{ISI:000311161700024}"
    }
    
  26. H A B Johansson, H Zettergren, A I S Holm, F Seitz, H T Schmidt, P Rousseau, A Lawicki, M Capron, A Domaracka, E Lattouf, S Maclot, R Maisonny, B Manil, J -Y Chesnel, L Adoui, B A Huber and H Cederquist.
    Ionization and fragmentation of polycyclic aromatic hydrocarbon clusters in collisions with keV ions. PHYSICAL REVIEW A 84(4), 2011.
    DOI BibTeX

    @article{ ISI:000295712700013,
    	author = "Johansson, H. A. B. and Zettergren, H. and Holm, A. I. S. and Seitz, F. and Schmidt, H. T. and Rousseau, P. and Lawicki, A. and Capron, M. and Domaracka, A. and Lattouf, E. and Maclot, S. and Maisonny, R. and Manil, B. and Chesnel, J. -Y. and Adoui, L. and Huber, B. A. and Cederquist, H.",
    	title = "{Ionization and fragmentation of polycyclic aromatic hydrocarbon clusters in collisions with keV ions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2011}",
    	volume = "{84}",
    	number = "{4}",
    	month = "{OCT 10}",
    	abstract = "{We report on an experimental study of the ionization and fragmentation of clusters of k polycyclic aromatic hydrocarbon (PAH) molecules using anthracene, C14H10, or coronene, C24H12. These PAH clusters are moderately charged and strongly heated in small impact parameter collisions with 22.5-keV He2+ ions, after which they mostly decay in long monomer evaporation sequences with singly charged and comparatively cold monomers as dominating end products. We describe a simple cluster evaporation model and estimate the number of PAH molecules in the clusters that have to be hit by He2+ projectiles for such complete cluster evaporations to occur. Highly charged and initially cold clusters are efficiently formed in collisions with 360-keV Xe20+ ions, leading to cluster Coulomb explosions and several hot charged fragments, which again predominantly yield singly charged, but much hotter, monomer ions than the He2+ collisions. We present a simple formula, based on density-functional-theory calculations, for the ionization energy sequences as functions of coronene cluster size, rationalized in terms of the classic electrostatic expression for the ionization of a charged conducting object. Our analysis indicates that multiple electron removal by highly charged ions from a cluster of PAH molecules rapidly may become more important than single ionization as the cluster size k increases and that this is the main reason for the unexpectedly strong heating in these types of collisions.}",
    	doi = "{10.1103/PhysRevA.84.043201}",
    	article-number = "{043201}",
    	issn = "{1050-2947}",
    	researcherid-numbers = "{Lawicki, Arkadiusz/G-2541-2011}",
    	unique-id = "{ISI:000295712700013}"
    }
    
  27. M Gudmundsson, D Fischer, D Misra, A Kallberg, A Simonsson, K Stochkel, H Cederquist and H T Schmidt.
    Two-site double-core-hole states formed when fast protons capture electrons from aligned N-2. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 44(17), 2011.
    DOI BibTeX

    @article{ ISI:000294891500009,
    	author = "Gudmundsson, M. and Fischer, D. and Misra, D. and Kallberg, A. and Simonsson, A. and Stochkel, K. and Cederquist, H. and Schmidt, H. T.",
    	title = "{Two-site double-core-hole states formed when fast protons capture electrons from aligned N-2}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{2011}",
    	volume = "{44}",
    	number = "{17}",
    	month = "{SEP 14}",
    	abstract = "{We report on an experimental investigation of 1.04 MeV H++N-2 electron transfer collisions. The fast protons were stored in the electron-cooler ion-storage ring, CRYRING, and the molecular nitrogen target was provided with a supersonic gas jet. We report momentum distributions of atomic nitrogen dissociation products Nq+ with charge states q+ (q = 1, 2, 3) which are detected in coincidence with neutralized projectiles. Further, we investigate the influence of the angle between the direction of the incoming projectile beam and the target molecular axis. The orientation of the latter is determined from the momentum vector of one emitted atomic nitrogen fragment ion. We find significantly higher total yields, dominated by N+, of charged atomic dissociation products when the N-2 molecular axis is perpendicular to the incoming H+-beam. The relative contributions from N2+- and N3+-fragments, however, are strongest when the N-2 axis is aligned-or close to aligned-with the ion beam. This, we suggest, is due to increased probabilities for the formation of two-site double-core-hole states.}",
    	doi = "{10.1088/0953-4075/44/17/175201}",
    	article-number = "{175201}",
    	issn = "{0953-4075}",
    	researcherid-numbers = "{Misra, Deepankar/C-8813-2009}",
    	unique-id = "{ISI:000294891500009}"
    }
    
  28. H A B Johansson, H Zettergren, A I S Holm, N Haag, Brondsted S Nielsen, J A Wyer, M -B S Kirketerp, K Stochkel, P Hvelplund, H T Schmidt and H Cederquist.
    Unimolecular dissociation of anthracene and acridine cations: The importance of isomerization barriers for the C2H2 loss and HCN loss channels. JOURNAL OF CHEMICAL PHYSICS 135(8), 2011.
    DOI BibTeX

    @article{ ISI:000294484700036,
    	author = "Johansson, H. A. B. and Zettergren, H. and Holm, A. I. S. and Haag, N. and Nielsen, S. Brondsted and Wyer, J. A. and Kirketerp, M. -B. S. and Stochkel, K. and Hvelplund, P. and Schmidt, H. T. and Cederquist, H.",
    	title = "{Unimolecular dissociation of anthracene and acridine cations: The importance of isomerization barriers for the C2H2 loss and HCN loss channels}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2011}",
    	volume = "{135}",
    	number = "{8}",
    	month = "{AUG 28}",
    	abstract = "{The loss of C2H2 is a low activation energy dissociation channel for anthracene (C14H10) and acridine (C13H9N) cations. For the latter ion another prominent fragmentation pathway is the loss of HCN. We have studied these two dissociation channels by collision induced dissociation experiments of 50 keV anthracene cations and protonated acridine, both produced by electrospray ionization, in collisions with a neutral xenon target. In addition, we have carried out density functional theory calculations on possible reaction pathways for the loss of C2H2 and HCN. The mass spectra display features of multi-step processes, and for protonated acridine the dominant first step process is the loss of a hydrogen from the N site, which then leads to C2H2/HCN loss from the acridine cation. With our calculations we have identified three pathways for the loss of C2H2 from the anthracene cation, with three different cationic products: 2-ethynylnaphthalene, biphenylene, and acenaphthylene. The third product is the one with the overall lowest dissociation energy barrier. For the acridine cation our calculated pathway for the loss of C2H2 leads to the 3-ethynylquinoline cation, and the loss of HCN leads to the biphenylene cation. Isomerization plays an important role in the formation of the non-ethynyl containing products. All calculated fragmentation pathways should be accessible in the present experiment due to substantial energy deposition in the collisions. (C) 2011 American Institute of Physics. {[}doi:10.1063/1.3626792]}",
    	doi = "{10.1063/1.3626792}",
    	article-number = "{084304}",
    	issn = "{0021-9606}",
    	unique-id = "{ISI:000294484700036}"
    }
    
  29. F Seitz, A I S Holm, H Zettergren, H A B Johansson, S Rosen, H T Schmidt, A Lawicki, J Rangama, P Rousseau, M Capron, R Maisonny, A Domaracka, L Adoui, A Mery, B Manil, B A Huber and H Cederquist.
    Polycyclic aromatic hydrocarbon-isomer fragmentation pathways: Case study for pyrene and fluoranthene molecules and clusters. JOURNAL OF CHEMICAL PHYSICS 135(6), 2011.
    DOI BibTeX

    @article{ ISI:000293955000012,
    	author = "Seitz, F. and Holm, A. I. S. and Zettergren, H. and Johansson, H. A. B. and Rosen, S. and Schmidt, H. T. and Lawicki, A. and Rangama, J. and Rousseau, P. and Capron, M. and Maisonny, R. and Domaracka, A. and Adoui, L. and Mery, A. and Manil, B. and Huber, B. A. and Cederquist, H.",
    	title = "{Polycyclic aromatic hydrocarbon-isomer fragmentation pathways: Case study for pyrene and fluoranthene molecules and clusters}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2011}",
    	volume = "{135}",
    	number = "{6}",
    	month = "{AUG 14}",
    	abstract = "{We report on measurements of the ionization and fragmentation of polycyclic aromatic hydrocarbon (PAH) targets in Xe(20+) + C(16)H(10) and Xe(20+) + {[}C(16)H(10)](k) collisions and compare results for the two C(16)H(10) isomers: pyrene and fluoranthene. For both types of targets, i.e., for single PAH molecules isolated in vacuum or for isomerically pure clusters of one of the molecules, the resulting fragment spectra are surprisingly similar. However, we do observe weak but significant isomer effects. Although these are manifested in very different ways for the monomer and cluster targets, they both have at their roots small differences (<2.5 eV) between the total binding energies of neutral, and singly and multiply charged pyrene and fluoranthene monomers. The results will be discussed in view of the density functional theory calculations of ionization and dissociation energies for fluoranthene and pyrene. A simple classical over-the-barrier model is used to estimate cross sections for single-and multiple-electron transfer between PAHs and ions. Calculated single and multiple ionization energies, and the corresponding model PAH ionization cross sections, are given. (C) 2011 American Institute of Physics. {[}doi: 10.1063/1.3622589]}",
    	doi = "{10.1063/1.3622589}",
    	article-number = "{064302}",
    	issn = "{0021-9606}",
    	researcherid-numbers = "{Lawicki, Arkadiusz/G-2541-2011}",
    	unique-id = "{ISI:000293955000012}"
    }
    
  30. R D Thomas, H T Schmidt, G Andler, M Bjorkhage, M Blom, L Brannholm, E Backstrom, H Danared, S Das, N Haag, P Hallden, F Hellberg, A I S Holm, H A B Johansson, A Kallberg, G Kallersjo, M Larsson, S Leontein, L Liljeby, P Lofgren, B Malm, S Mannervik, M Masuda, D Misra, A Orban, A Paal, P Reinhed, K -G Rensfelt, S Rosen, K Schmidt, F Seitz, A Simonsson, J Weimer, H Zettergren and H Cederquist.
    The double electrostatic ion ring experiment: A unique cryogenic electrostatic storage ring for merged ion-beams studies. REVIEW OF SCIENTIFIC INSTRUMENTS 82(6), June 2011.
    DOI BibTeX

    @article{ ISI:000292334000069,
    	author = "Thomas, R. D. and Schmidt, H. T. and Andler, G. and Bjorkhage, M. and Blom, M. and Brannholm, L. and Backstrom, E. and Danared, H. and Das, S. and Haag, N. and Hallden, P. and Hellberg, F. and Holm, A. I. S. and Johansson, H. A. B. and Kallberg, A. and Kallersjo, G. and Larsson, M. and Leontein, S. and Liljeby, L. and Lofgren, P. and Malm, B. and Mannervik, S. and Masuda, M. and Misra, D. and Orban, A. and Paal, A. and Reinhed, P. and Rensfelt, K. -G. and Rosen, S. and Schmidt, K. and Seitz, F. and Simonsson, A. and Weimer, J. and Zettergren, H. and Cederquist, H.",
    	title = "{The double electrostatic ion ring experiment: A unique cryogenic electrostatic storage ring for merged ion-beams studies}",
    	journal = "{REVIEW OF SCIENTIFIC INSTRUMENTS}",
    	year = "{2011}",
    	volume = "{82}",
    	number = "{6}",
    	month = "{JUN}",
    	abstract = "{We describe the design of a novel type of storage device currently under construction at Stockholm University, Sweden, using purely electrostatic focussing and deflection elements, in which ion beams of opposite charges are confined under extreme high vacuum cryogenic conditions in separate ``rings{''} and merged over a common straight section. The construction of this double electrostatic ion ring experiment uniquely allows for studies of interactions between cations and anions at low and well-defined internal temperatures and centre-of-mass collision energies down to about 10 K and 10 meV, respectively. Position sensitive multi-hit detector systems have been extensively tested and proven to work in cryogenic environments and these will be used to measure correlations between reaction products in, for example, electron-transfer processes. The technical advantages of using purely electrostatic ion storage devices over magnetic ones are many, but the most relevant are: electrostatic elements which are more compact and easier to construct; remanent fields, hysteresis, and eddy-currents, which are of concern in magnetic devices, are no longer relevant; and electrical fields required to control the orbit of the ions are not only much easier to create and control than the corresponding magnetic fields, they also set no upper mass limit on the ions that can be stored. These technical differences are a boon to new areas of fundamental experimental research, not only in atomic and molecular physics but also in the boundaries of these fields with chemistry and biology. For examples, studies of interactions with internally cold molecular ions will be particular useful for applications in astrophysics, while studies of solvated ionic clusters will be of relevance to aeronomy and biology. (C) 2011 American Institute of Physics. {[}doi:10.1063/1.3602928]}",
    	doi = "{10.1063/1.3602928}",
    	article-number = "{065112}",
    	issn = "{0034-6748}",
    	researcherid-numbers = "{Misra, Deepankar/C-8813-2009}",
    	unique-id = "{ISI:000292334000069}"
    }
    
  31. A Lawicki, A I S Holm, P Rousseau, M Capron, R Maisonny, S Maclot, F Seitz, H A B Johansson, S Rosen, H T Schmidt, H Zettergren, B Manil, L Adoui, H Cederquist and B A Huber.
    Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions. PHYSICAL REVIEW A 83(2), 2011.
    DOI BibTeX

    @article{ ISI:000287076800006,
    	author = "Lawicki, A. and Holm, A. I. S. and Rousseau, P. and Capron, M. and Maisonny, R. and Maclot, S. and Seitz, F. and Johansson, H. A. B. and Rosen, S. and Schmidt, H. T. and Zettergren, H. and Manil, B. and Adoui, L. and Cederquist, H. and Huber, B. A.",
    	title = "{Multiple ionization and fragmentation of isolated pyrene and coronene molecules in collision with ions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2011}",
    	volume = "{83}",
    	number = "{2}",
    	month = "{FEB 8}",
    	abstract = "{The interaction of multiply charged ions (He(2+), O(3+), and Xe(20+)) with gas-phase pericondensed polycyclic aromatic hydrocarbon (PAH) molecules of coronene (C(24)H(12)) and pyrene (C(16)H(10)) is studied for low-velocity collisions (v <= 0.6 a.u.). The mass spectrometric analysis shows that singly and up to quadruply charged intact molecules are important reaction products. The relative experimental yields are compared with the results of a simple classical over-the-barrier model. For higher molecular charge states, the experimental yields decrease much more strongly than the model predictions due to the instabilities of the multiply charged PAH molecules. Even-odd oscillations with the number of carbon atoms, n, in the intensity distributions of the C(n)H(x)(+) fragments indicate a linear chain structure of the fragments similar to those observed for ion-C(60) collisions. The latter oscillations are known to be due to dissociation energy differences between even-and odd-n C(n)-chain molecules. For PAH molecules, the average numbers of H atoms attached to the C(n)H(x) chains are larger for even-n reflecting acetylenic bond systems.}",
    	doi = "{10.1103/PhysRevA.83.022704}",
    	article-number = "{022704}",
    	issn = "{1050-2947}",
    	researcherid-numbers = "{Lawicki, Arkadiusz/G-2541-2011}",
    	unique-id = "{ISI:000287076800006}"
    }
    
  32. A I S Holm, H A B Johansson, H Cederquist and H Zettergren.
    Dissociation and multiple ionization energies for five polycyclic aromatic hydrocarbon molecules. JOURNAL OF CHEMICAL PHYSICS 134(4), 2011.
    DOI BibTeX

    @article{ ISI:000286897600044,
    	author = "Holm, A. I. S. and Johansson, H. A. B. and Cederquist, H. and Zettergren, H.",
    	title = "{Dissociation and multiple ionization energies for five polycyclic aromatic hydrocarbon molecules}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2011}",
    	volume = "{134}",
    	number = "{4}",
    	month = "{JAN 28}",
    	abstract = "{We have performed density functional theory calculations for a range of neutral, singly, and multiply charged polycyclic aromatic hydrocarbons (PAHs), and their fragmentation products for H-, H(+)-, C(2)H(2)-, and C(2)H(2)(+)-emissions. The adiabatic and vertical ionization energies follow linear dependencies as functions of charge state for all five intact PAHs (naphthalene, biphenylene, anthracene, pyrene, and coronene). First estimates of the total ionization and fragmentation cross sections in ion-PAH collisions display markedly different size dependencies for pericondensed and catacondensed PAH species, reflecting differences in their first ionization energies. The dissociation energies show that the PAH(q+)-molecules are thermodynamically stable for q <= 2 (naphthalene, biphenylene, and anthracene), q <= 3 (pyrene), and q <= 4 (coronene). PAHs in charge states above these limits may also survive experimental time scales due to the presence of reaction barriers as deduced from explorations of the potential energy surface regions for H(+)-emissions from all five PAHs and for C(2)H(2)(+)-emission from naphthalene - the smallest PAH. (C) 2011 American Institute of Physics. {[}doi:10.1063/1.3541252]}",
    	doi = "{10.1063/1.3541252}",
    	article-number = "{044301}",
    	issn = "{0021-9606}",
    	unique-id = "{ISI:000286897600044}"
    }
    
  33. N Haag, A I S Holm, H A B Johansson, H Zettergren, H T Schmidt, Brondsted S Nielsen, P Hvelplund and H Cederquist.
    Electron capture induced dissociation of doubly protonated pentapeptides: Dependence on molecular structure and charge separation. JOURNAL OF CHEMICAL PHYSICS 134(3), 2011.
    DOI BibTeX

    @article{ ISI:000286472200071,
    	author = "Haag, N. and Holm, A. I. S. and Johansson, H. A. B. and Zettergren, H. and Schmidt, H. T. and Nielsen, S. Brondsted and Hvelplund, P. and Cederquist, H.",
    	title = "{Electron capture induced dissociation of doubly protonated pentapeptides: Dependence on molecular structure and charge separation}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2011}",
    	volume = "{134}",
    	number = "{3}",
    	month = "{JAN 21}",
    	abstract = "{We have studied electron capture induced dissociation of a set of doubly protonated pentapeptides, all composed of one lysine (K) and either four glycine (G) or four alanine (A) residues, as a function of the sequence of these building blocks. Thereby the separation of the two charges, sequestered on the N-terminal amino group and the lysine side chain, is varied. The characteristic cleavage of N-C(alpha) bonds is observed for all peptides over the whole backbone length, with the charge carrying fragments always containing K. The resulting fragmentation patterns are very similar if G is replaced by A. In the case of {[}XKXXX+2H](2+) (X=A or G), a distinct feature is observed in the distribution of backbone cleavage fragments and the probability for ammonia loss is drastically reduced. This may be due to an isomer with an amide oxygen as protonation site giving rise to the observed increase in breakage at a specific site in the molecule. For the other peptides, a correlation with the distance between amide oxygen and the charge at the lysine side chain has been found. This may be an indication that it is only the contribution from this site to the charge stabilization of the amide pi{*} orbitals which determines relative fragment intensities. For comparison, complexes with two crown ether molecules have been studied as well. The crown ether provides a shielding of the charge and prevents the peptide from folding and internal hydrogen bonding, which leads to a more uniform fragmentation behavior. (C) 2011 American Institute of Physics. {[}doi:10.1063/1.3533952]}",
    	doi = "{10.1063/1.3533952}",
    	article-number = "{035102}",
    	issn = "{0021-9606}",
    	unique-id = "{ISI:000286472200071}"
    }
    
  34. A I S Holm, H Zettergren, H A B Johansson, F Seitz, S Rosen, H T Schmidt, A Lawicki, J Rangama, P Rousseau, M Capron, R Maisonny, L Adoui, A Mery, B Manil, B A Huber and H Cederquist.
    Ions Colliding with Cold Polycyclic Aromatic Hydrocarbon Clusters. PHYSICAL REVIEW LETTERS 105(21), 2010.
    DOI BibTeX

    @article{ ISI:000284407400012,
    	author = "Holm, A. I. S. and Zettergren, H. and Johansson, H. A. B. and Seitz, F. and Rosen, S. and Schmidt, H. T. and Lawicki, A. and Rangama, J. and Rousseau, P. and Capron, M. and Maisonny, R. and Adoui, L. and Mery, A. and Manil, B. and Huber, B. A. and Cederquist, H.",
    	title = "{Ions Colliding with Cold Polycyclic Aromatic Hydrocarbon Clusters}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2010}",
    	volume = "{105}",
    	number = "{21}",
    	month = "{NOV 19}",
    	abstract = "{We report the first experimental study of ions interacting with clusters of polycyclic aromatic hydrocarbon (PAH) molecules. Collisions between 11.25 keV He-3(+) or 360 keV Xe-129(20+) and weakly bound clusters of one of the smallest PAH molecules, anthracene, show that C14H10 clusters have much higher tendencies to fragment in ion collisions than other weakly bound clusters. The ionization is dominated by peripheral collisions in which the clusters, very surprisingly, are more strongly heated by Xe20+ collisions than by He+ collisions. The appearance size is k = 15 for {[}C14H10](k)(2+).}",
    	doi = "{10.1103/PhysRevLett.105.213401}",
    	article-number = "{213401}",
    	issn = "{0031-9007}",
    	researcherid-numbers = "{Lawicki, Arkadiusz/G-2541-2011}",
    	unique-id = "{ISI:000284407400012}"
    }
    
  35. M Gudmundsson, D Fischer, N Haag, H A B Johansson, D Misra, P Reinhed, H Schmidt-Boecking, R Schuch, M Schoeffler, K Stochkel, H T Schmidt and H Cederquist.
    Angular scattering in fast ion-atom electron transfer collisions: projectile wave diffraction and Thomas mechanisms. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 43(18, SI), 2010.
    DOI BibTeX

    @article{ ISI:000281530700013,
    	author = "Gudmundsson, M. and Fischer, D. and Haag, N. and Johansson, H. A. B. and Misra, D. and Reinhed, P. and Schmidt-Boecking, H. and Schuch, R. and Schoeffler, M. and Stochkel, K. and Schmidt, H. T. and Cederquist, H.",
    	title = "{Angular scattering in fast ion-atom electron transfer collisions: projectile wave diffraction and Thomas mechanisms}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{2010}",
    	volume = "{43}",
    	number = "{18, SI}",
    	month = "{SEP 28}",
    	abstract = "{We report experimental angular differential cross sections for double-electron capture in He(2+) + He collisions and single-electron capture in H(+) + He collisions for the 1.3-12.5 MeV kinetic energy range. In all cases, the total cross sections are dominated by forward scattering peaks in d sigma/d Omega. The shapes and widths (but not the magnitudes) of these peaks are very similar for all energies and for capture of one or two electrons corresponding also to our measured linear increases in the transverse momentum transfers with increasing projectile velocities. These observations may be ascribed to diffraction limitations which are connected to electron transfer probabilities P(b) which are significant in limited regions of b only. For the H(+) + He single-electron capture we observe two additional maxima in the angular differential cross sections. We conclude that while the secondary maxima at similar to 0.5 mrad probably have large contributions from the Thomas proton-electron-nucleus scattering mechanism, the third maxima at similar to 0.75 mrad are most likely mainly due to projectile de Broglie wave diffraction.}",
    	doi = "{10.1088/0953-4075/43/18/185209}",
    	article-number = "{185209}",
    	issn = "{0953-4075}",
    	researcherid-numbers = "{Misra, Deepankar/C-8813-2009}",
    	unique-id = "{ISI:000281530700013}"
    }
    
  36. H Zettergren, H A B Johansson, H T Schmidt, J Jensen, P Hvelplund, S Tomita, Y Wang, F Martin, M Alcami, B Manil, L Maunoury, B A Huber and H Cederquist.
    Magic and hot giant fullerenes formed inside ion irradiated weakly bound C-60 clusters. JOURNAL OF CHEMICAL PHYSICS 133(10), 2010.
    DOI BibTeX

    @article{ ISI:000282475400015,
    	author = "Zettergren, H. and Johansson, H. A. B. and Schmidt, H. T. and Jensen, J. and Hvelplund, P. and Tomita, S. and Wang, Y. and Martin, F. and Alcami, M. and Manil, B. and Maunoury, L. and Huber, B. A. and Cederquist, H.",
    	title = "{Magic and hot giant fullerenes formed inside ion irradiated weakly bound C-60 clusters}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2010}",
    	volume = "{133}",
    	number = "{10}",
    	month = "{SEP 14}",
    	abstract = "{We find that the most stable fullerene isomers, C-70-C-94, form efficiently in close-to central collisions between keV atomic ions and weakly bound clusters of more than 15 C-60-molecules. We observe extraordinarily high yields of C-70 and marked preferences for C-78 and C-84. Larger even-size carbon molecules, C-96-C-180, follow a smooth log-normal (statistical) intensity distribution. Measurements of kinetic energies indicate that C-70-C-94 mainly are formed by coalescence reactions between small carbon molecules and Coo, while C-n with n >= 96 are due to self-assembly (of small molecules) and shrinking hot giant fullerenes. (C) 2010 American Institute of Physics. {[}doi:10.1063/1.3479584]}",
    	doi = "{10.1063/1.3479584}",
    	article-number = "{104301}",
    	issn = "{0021-9606}",
    	researcherid-numbers = "{Alcami, Manuel/F-1366-2010}",
    	orcid-numbers = "{Alcami, Manuel/0000-0002-3753-5215}",
    	unique-id = "{ISI:000282475400015}"
    }
    
  37. P Reinhed, A Orban, S Rosen, R D Thomas, I Kashperka, H A B Johansson, D Misra, A Fardi, L Brannholm, M Bjorkhage, H Cederquist and H T Schmidt.
    Cryogenic keV ion-beam storage in ConeTrap-A tool for ion-temperature control. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 621(1-3):83-90, September 2010.
    DOI BibTeX

    @article{ ISI:000281109100011,
    	author = "Reinhed, P. and Orban, A. and Rosen, S. and Thomas, R. D. and Kashperka, I. and Johansson, H. A. B. and Misra, D. and Fardi, A. and Brannholm, L. and Bjorkhage, M. and Cederquist, H. and Schmidt, H. T.",
    	title = "{Cryogenic keV ion-beam storage in ConeTrap-A tool for ion-temperature control}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT}",
    	year = "{2010}",
    	volume = "{621}",
    	number = "{1-3}",
    	pages = "{83-90}",
    	month = "{SEP}",
    	abstract = "{We have tested the ion-storage capabilities of the compact triple-electrode electrostatic ion-beam trap, ConeTrap, down to cryogenic temperatures. The low-temperature operation of this electrostatic storage device is an important test for the double electrostatic ion-ring experiment, DESIREE, which is presently under construction at Stockholm University. In the present work we measured the pressure dependent storage lifetimes of 2.5 keV He(+) and 2.8 keV Ar(+) ion beams in ConeTrap at temperatures down to 28 K and pressures down to 1.3 x 10(-10) mbar. The so far longest measured ion storage lifetime using this system is 21.5 +/- 3.8 s for Ar(+) ions. The present combination of ConeTrap and the cryogenic experimental chamber was recently applied in the first black-body-correction free measurement of the lifetime of the metastable He(-) ion at 10 K {[}1]. (C) 2010 Elsevier B.V. All rights reserved.}",
    	doi = "{10.1016/j.nima.2010.06.008}",
    	issn = "{0168-9002}",
    	researcherid-numbers = "{Misra, Deepankar/C-8813-2009}",
    	unique-id = "{ISI:000281109100011}"
    }
    
  38. S Wethekam, H Zettergren, Ch. Linsmeier, H Cederquist and H Winter.
    Resonant electron capture by C-60 ions at a metal surface with projected band gap. PHYSICAL REVIEW B 81(12), March 2010.
    DOI BibTeX

    @article{ ISI:000276248900036,
    	author = "Wethekam, S. and Zettergren, H. and Linsmeier, Ch. and Cederquist, H. and Winter, H.",
    	title = "{Resonant electron capture by C-60 ions at a metal surface with projected band gap}",
    	journal = "{PHYSICAL REVIEW B}",
    	year = "{2010}",
    	volume = "{81}",
    	number = "{12}",
    	month = "{MAR}",
    	abstract = "{C-60(+) and C-60(2+) ions are scattered under grazing incidence from an atomically clean and flat Be(0001) surface at kilo-electron-volt energies. Distances for electron transfer are deduced from shifts of angular distributions for incident C-60(+) and C-60(2+) projectiles, which reflect changes in the interaction potentials at the instants of electron transfers. These distances are consistent with classical over-the-barrier model results indicating that the suppression of charge transfer, observed for atomic projectiles in front of metal surfaces with a projected band gap, is absent for fullerenes.}",
    	doi = "{10.1103/PhysRevB.81.121416}",
    	article-number = "{121416}",
    	issn = "{1098-0121}",
    	unique-id = "{ISI:000276248900036}"
    }
    
  39. D Fischer, M Gudmundsson, Z Berenyi, N Haag, H A B Johansson, D Misra, P Reinhed, A Kallberg, A Simonsson, K Stochkel, H Cederquist and H T Schmidt.
    Importance of Thomas single-electron transfer in fast p-He collisions. PHYSICAL REVIEW A 81(1), January 2010.
    DOI BibTeX

    @article{ ISI:000277958100023,
    	author = "Fischer, D. and Gudmundsson, M. and Berenyi, Z. and Haag, N. and Johansson, H. A. B. and Misra, D. and Reinhed, P. and Kallberg, A. and Simonsson, A. and Stochkel, K. and Cederquist, H. and Schmidt, H. T.",
    	title = "{Importance of Thomas single-electron transfer in fast p-He collisions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2010}",
    	volume = "{81}",
    	number = "{1}",
    	month = "{JAN}",
    	abstract = "{We report experimental angular differential cross sections for nonradiative single-electron capture in p-He collisions (p + He -> H + He(+)) with a separate peak at the 0.47 mrad Thomas scattering angle for energies in the 1.3-12.5 MeV range. We find that the intensity of this peak scales with the projectile velocity as v(P)(-11). This constitutes the first experimental test of the prediction from 1927 by L. H. Thomas {[}Proc. R. Soc. 114, 561 (1927)]. At our highest energy, the peak at the Thomas angle contributes with 13.5\% to the total integrated nonradiative single-electron capture cross section.}",
    	doi = "{10.1103/PhysRevA.81.012714}",
    	article-number = "{012714}",
    	issn = "{1050-2947}",
    	researcherid-numbers = "{Misra, Deepankar/C-8813-2009}",
    	unique-id = "{ISI:000277958100023}"
    }
    
  40. P Reinhed, A Orban, J Werner, S Rosen, R D Thomas, I Kashperka, H A B Johansson, D Misra, L Brannholm, M Bjorkhage, H Cederquist and H T Schmidt.
    Precision Lifetime Measurements of He- in a Cryogenic Electrostatic Ion-Beam Trap. PHYSICAL REVIEW LETTERS 103(21), 2009.
    DOI BibTeX

    @article{ ISI:000272054300014,
    	author = "Reinhed, P. and Orban, A. and Werner, J. and Rosen, S. and Thomas, R. D. and Kashperka, I. and Johansson, H. A. B. and Misra, D. and Brannholm, L. and Bjorkhage, M. and Cederquist, H. and Schmidt, H. T.",
    	title = "{Precision Lifetime Measurements of He- in a Cryogenic Electrostatic Ion-Beam Trap}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2009}",
    	volume = "{103}",
    	number = "{21}",
    	month = "{NOV 20}",
    	abstract = "{We have developed a small purely electrostatic ion-beam trap which may be operated in thermal equilibrium at precisely controlled temperatures down to 10 K. Thus, we avoid magnetic field induced mixing of quantum states and may effectively eliminate any influence from absorption of photons from blackbody radiation. We report the first correction-free measurement of the lifetime of the 1s2s2p P-4(5/2)o level of He-4(-) yielding the high-precision result 359.0 +/- 0.7 mu s. This result is an essential proof-of-principle for cryogenic electrostatic storage rings and traps for atomic and molecular physics.}",
    	doi = "{10.1103/PhysRevLett.103.213002}",
    	article-number = "{213002}",
    	issn = "{0031-9007}",
    	unique-id = "{ISI:000272054300014}"
    }
    
  41. Henning Zettergren, Lamri Adoui, Virgile Bernigaud, Henrik Cederquist, Nicole Haag, Anne I S Holm, Bernd A Huber, Preben Hvelplund, Henrik Johansson, Umesh Kadhane, Mikkel Koefoed Larsen, Bo Liu, Bruno Manil, Steen Brondsted Nielsen, Subhasis Panja, Jimmy Rangama, Peter Reinhed, Henning T Schmidt and Kristian Stochkel.
    Electron-Capture-Induced Dissociation of Microsolvated Di- and Tripeptide Monocations: Elucidation of Fragmentation Channels from Measurements of Negative Ions. CHEMPHYSCHEM 10(9-10):1619-1623, 2009.
    DOI BibTeX

    @article{ ISI:000267928100039,
    	author = "Zettergren, Henning and Adoui, Lamri and Bernigaud, Virgile and Cederquist, Henrik and Haag, Nicole and Holm, Anne I. S. and Huber, Bernd A. and Hvelplund, Preben and Johansson, Henrik and Kadhane, Umesh and Larsen, Mikkel Koefoed and Liu, Bo and Manil, Bruno and Nielsen, Steen Brondsted and Panja, Subhasis and Rangama, Jimmy and Reinhed, Peter and Schmidt, Henning T. and Stochkel, Kristian",
    	title = "{Electron-Capture-Induced Dissociation of Microsolvated Di- and Tripeptide Monocations: Elucidation of Fragmentation Channels from Measurements of Negative Ions}",
    	journal = "{CHEMPHYSCHEM}",
    	year = "{2009}",
    	volume = "{10}",
    	number = "{9-10}",
    	pages = "{1619-1623}",
    	month = "{JUL 13}",
    	abstract = "{{The results from an experimental study of bare and microsolvated peptide monocations in high-energy collision with cesium vapor are reported. Neutral radicals form after electron capture from cesium, which decay by H loss, NH, loss or N-C bond cleavage into characteristic z and c fragments. The neutral fragments are converted into negatively charged species in a second collision with cesium and are identified by means of mass spectrometry. For protonated GA (G = glycan",
    	a = "",
    	doi = "{10.1002/cphc.200800782}",
    	issn = "{1439-4235}",
    	unique-id = "{ISI:000267928100039}"
    }
    
  42. Deepankar Misra, H T Schmidt, M Gudmundsson, D Fischer, N Haag, H A B Johansson, A Kallberg, B Najjari, P Reinhed, R Schuch, M Schoeffler, A Simonsson, A B Voitkiv and H Cederquist.
    Two-Center Double-Capture Interference in Fast He2++H-2 Collisions. PHYSICAL REVIEW LETTERS 102(15), 2009.
    DOI BibTeX

    @article{ ISI:000265285700025,
    	author = "Misra, Deepankar and Schmidt, H. T. and Gudmundsson, M. and Fischer, D. and Haag, N. and Johansson, H. A. B. and Kallberg, A. and Najjari, B. and Reinhed, P. and Schuch, R. and Schoeffler, M. and Simonsson, A. and Voitkiv, A. B. and Cederquist, H.",
    	title = "{Two-Center Double-Capture Interference in Fast He2++H-2 Collisions}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2009}",
    	volume = "{102}",
    	number = "{15}",
    	month = "{APR 17}",
    	abstract = "{We report the first observation of Young-type interference effects in a two-electron transfer process. These effects change strongly as the projectile velocity changes in fast (1.2 and 2.0 MeV) He2++H-2 collisions as manifested in strong variations of the double-electron capture rates with the H-2 orientation. This is consistent with fully quantum mechanical calculations, which ignore sequential electron transfer, and a simple projectile de Broglie wave picture assuming that two-electron transfer probabilities are higher in collisions where the projectile passes close to either one of the H-2 nuclei.}",
    	doi = "{10.1103/PhysRevLett.102.153201}",
    	article-number = "{153201}",
    	issn = "{0031-9007}",
    	researcherid-numbers = "{Misra, Deepankar/C-8813-2009}",
    	unique-id = "{ISI:000265285700025}"
    }
    
  43. Jean Ann Wyer, Henrik Cederquist, Nicote Haag, Bernd A Huber, Preben Hvelplund, Henrik A B Johansson, Remi Maisonny, Steen Brondsted Nielsen, Jimmy Rangama, Patrick Rousseau and Henning T Schmidt.
    On the hydrogen loss from protonated nucleobases after electronic excitation or collisional electron capture. EUROPEAN JOURNAL OF MASS SPECTROMETRY 15(6):681-688, 2009.
    DOI BibTeX

    @article{ ISI:000272826100002,
    	author = "Wyer, Jean Ann and Cederquist, Henrik and Haag, Nicote and Huber, Bernd A. and Hvelplund, Preben and Johansson, Henrik A. B. and Maisonny, Remi and Nielsen, Steen Brondsted and Rangama, Jimmy and Rousseau, Patrick and Schmidt, Henning T.",
    	title = "{On the hydrogen loss from protonated nucleobases after electronic excitation or collisional electron capture}",
    	journal = "{EUROPEAN JOURNAL OF MASS SPECTROMETRY}",
    	year = "{2009}",
    	volume = "{15}",
    	number = "{6}",
    	pages = "{681-688}",
    	abstract = "{In this work, we have subjected protonated nucleobases MH(+) (M = guanine, adenine, thymine, uracil and cytosine) to a range of experiments that involve high-energy (50 keV) collision-induced dissociation (CID) and electron capture-induced dissociation. In the tatter case, both neutralisation reionisation and charge reversal were done. For the CID experiments, the ions interacted with O(2). In neutral reionisation, caesium atoms were used as the target gas and the protonated nucleobases captured electrons to give neutrals. These were reionised to cations a microsecond later in collisions with O(2). In choosing Cs as the target gas, we have ensured that the first electron transfer process is favourable (by about 0.1-0.8 eV depending on the base). In the case of protonated adenine, charge reversal experiments (two Cs collisions) were also carried out, with the results corroborating those from the neutralisation-reionisation experiments. We find that white collisional excitation of protonated nucleobases in O(2) may lead to hydrogen loss with limited probabilities, this channel becomes dominant for electron capture events. Indeed, when sampling reionised neutrals on a microsecond timescale, we see that the ratio between MH(+) and M(+) is 0.2-0.4 when one electron is captured from Cs. There are differences in these ratios between the bases but no obvious correlation with recombination energies was found.}",
    	doi = "{10.1255/ejms.1039}",
    	issn = "{1469-0667}",
    	researcherid-numbers = "{Wyer, Jean/B-2455-2010}",
    	unique-id = "{ISI:000272826100002}"
    }
    
  44. Virgile Bernigaud, Henrik Cederquist, Nicole Haag, Anne I S Holm, Bernd A Huber, Preben Hvelplund, Umesh Kadhane, Mikkel Koefoed Larsen, Bruno Manil, Steen Brondsted Nielsen, Subhasis Panja, Sylwia Ptasinska, Jimmy Rangama, Peter Reinhed, Henning T Schmidt, Alexey V Streletskii, Kristian Stochkel, Esben S Worm and Henning Zettergren.
    Electron capture-induced dissociation of AK dipeptide dications: Influence of ion velocity, crown-ether complexation and collision gas. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY 276(2-3):77-81, 2008.
    DOI BibTeX

    @article{ ISI:000259846000002,
    	author = "Bernigaud, Virgile and Cederquist, Henrik and Haag, Nicole and Holm, Anne I. S. and Huber, Bernd A. and Hvelplund, Preben and Kadhane, Umesh and Larsen, Mikkel Koefoed and Manil, Bruno and Nielsen, Steen Brondsted and Panja, Subhasis and Ptasinska, Sylwia and Rangama, Jimmy and Reinhed, Peter and Schmidt, Henning T. and Streletskii, Alexey V. and Stochkel, Kristian and Worm, Esben S. and Zettergren, Henning",
    	title = "{Electron capture-induced dissociation of AK dipeptide dications: Influence of ion velocity, crown-ether complexation and collision gas}",
    	journal = "{INTERNATIONAL JOURNAL OF MASS SPECTROMETRY}",
    	year = "{2008}",
    	volume = "{276}",
    	number = "{2-3}",
    	pages = "{77-81}",
    	month = "{OCT 1}",
    	abstract = "{The fragmentation of doubly protonated AK dipeptide ions has been investigated after collisional electron transfer. Electron capture leads to three dominant channels, H loss, NH3 loss, and N-C-alpha bond breakage to give either c(+) or z(+) fragment ions. The relative importance of these channels has been explored as a function of ion velocity, the degree of complexation with crown ether, and collision gas. Our results indicate that H loss and NH3 loss are competing channels whereas the probability of N-C-alpha bond breakage is more or less constant. (C) 2008 Elsevier B.V. All rights reserved.}",
    	doi = "{10.1016/j.ijms.2008.05.004}",
    	issn = "{1387-3806}",
    	unique-id = "{ISI:000259846000002}"
    }
    
  45. N Haag, Z Berenyi, P Reinhed, D Fischer, M Gudmundsson, H A B Johansson, H T Schmidt, H Cederquist and H Zettergren.
    Kinetic-energy-release distributions and barrier heights for C(2)a+ emission from multiply charged C(60) and C(70) fullerenes. PHYSICAL REVIEW A 78(4), October 2008.
    DOI BibTeX

    @article{ ISI:000260574100097,
    	author = "Haag, N. and Berenyi, Z. and Reinhed, P. and Fischer, D. and Gudmundsson, M. and Johansson, H. A. B. and Schmidt, H. T. and Cederquist, H. and Zettergren, H.",
    	title = "{Kinetic-energy-release distributions and barrier heights for C(2)a+ emission from multiply charged C(60) and C(70) fullerenes}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2008}",
    	volume = "{78}",
    	number = "{4}",
    	month = "{OCT}",
    	doi = "{10.1103/PhysRevA.78.043201}",
    	article-number = "{043201}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000260574100097}"
    }
    
  46. H T Schmidt, D Fischer, Z Berenyi, C L Cocke, M Gudmundsson, N Haag, H A B Johansson, A Kaellberg, S B Levin, P Reinhed, U Sassenberg, R Schuch, A Simonsson, K Stochkel and H Cederquist.
    Evidence of wave-particle duality for single fast hydrogen atoms. PHYSICAL REVIEW LETTERS 101(8), 2008.
    DOI BibTeX

    @article{ ISI:000258643600021,
    	author = "Schmidt, H. T. and Fischer, D. and Berenyi, Z. and Cocke, C. L. and Gudmundsson, M. and Haag, N. and Johansson, H. A. B. and Kaellberg, A. and Levin, S. B. and Reinhed, P. and Sassenberg, U. and Schuch, R. and Simonsson, A. and Stochkel, K. and Cederquist, H.",
    	title = "{Evidence of wave-particle duality for single fast hydrogen atoms}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2008}",
    	volume = "{101}",
    	number = "{8}",
    	month = "{AUG 22}",
    	abstract = "{We report the direct observation of interference effects in a Young's double-slit experiment where the interfering waves are two spatially separated components of the de Broglie wave of single 1.3 MeV hydrogen atoms formed close to either target nucleus in H(+) + H(2) electron-transfer collisions. Quantum interference strongly influences the results even though the hydrogen atoms have a de Broglie wavelength, lambda(dB), as small as 25 fm.}",
    	doi = "{10.1103/PhysRevLett.101.083201}",
    	article-number = "{083201}",
    	issn = "{0031-9007}",
    	unique-id = "{ISI:000258643600021}"
    }
    
  47. Henning T Schmidt, Henrik A B Johansson, Richard D Thomas, Wolf D Geppert, Nicole Haag, Peter Reinhed, Stefan Rosen, Mats Larsson, Hakan Danared, K -G Rensfelt, Leif Liljeby, Lars Bagge, Mikael Bjorkhage, Mikael Blom, Patrik Lofgren, Anders Kallberg, Ansgar Simonsson, Andras Paal, Henning Zettergren and Henrik Cederquist.
    DESIREE as a new tool for interstellar ion chemistry. INTERNATIONAL JOURNAL OF ASTROBIOLOGY 7(3-4):205-208, 2008.
    DOI BibTeX

    @article{ ISI:000273383100003,
    	author = "Schmidt, Henning T. and Johansson, Henrik A. B. and Thomas, Richard D. and Geppert, Wolf D. and Haag, Nicole and Reinhed, Peter and Rosen, Stefan and Larsson, Mats and Danared, Hakan and Rensfelt, K. -G. and Liljeby, Leif and Bagge, Lars and Bjorkhage, Mikael and Blom, Mikael and Lofgren, Patrik and Kallberg, Anders and Simonsson, Ansgar and Paal, Andras and Zettergren, Henning and Cederquist, Henrik",
    	title = "{DESIREE as a new tool for interstellar ion chemistry}",
    	journal = "{INTERNATIONAL JOURNAL OF ASTROBIOLOGY}",
    	year = "{2008}",
    	volume = "{7}",
    	number = "{3-4}",
    	pages = "{205-208}",
    	month = "{JUL-OCT}",
    	abstract = "{A novel cryogenic electrostatic storage device consisting of two ion-beam storage rings with a common straight section for studies of interactions between oppositely charged ions at low and well-defined relative velocities is under construction at Stockholm University. Here we consider the prospect Of using this new tool to measure cross-sections and rate coefficients for Mutual neutralization reactions of importance in interstellar ion chemistry in general and specifically in cosmic pre-biotic ion chemistry.}",
    	doi = "{10.1017/S1473550408004229}",
    	issn = "{1473-5504}",
    	unique-id = "{ISI:000273383100003}"
    }
    
  48. J Bernard, G Montagne, R Bredy, B Terpend-Ordaciere, A Bourgey, M Kerleroux, L Chen, H T Schmidt, H Cederquist and S Martin.
    {A “tabletop” electrostatic ion storage ring: Mini-Ring}. REVIEW OF SCIENTIFIC INSTRUMENTS 79(7), July 2008.
    DOI BibTeX

    @article{ ISI:000258179400053,
    	author = "Bernard, J. and Montagne, G. and Bredy, R. and Terpend-Ordaciere, B. and Bourgey, A. and Kerleroux, M. and Chen, L. and Schmidt, H. T. and Cederquist, H. and Martin, S.",
    	title = "{A ``tabletop{''} electrostatic ion storage ring: Mini-Ring}",
    	journal = "{REVIEW OF SCIENTIFIC INSTRUMENTS}",
    	year = "{2008}",
    	volume = "{79}",
    	number = "{7}",
    	month = "{JUL}",
    	abstract = "{We report on the design, construction, and commissioning of a novel electrostatic ion storage ring of small dimensions-in the following referred to as ``Mini-Ring.{''} Mini-Ring consists of four horizontal parallel-plate deflectors and two conical electrostatic mirrors. Ions are injected through the two deflectors on the injection side and off axis with respect to the conical mirrors which face each other. The first injection deflector, originally at zero voltage, is switched to its set value such that the ions after one turn follow stable trajectories of lengths of roughly 30 cm. This design reduces the number of electrodes necessary to guide the ion beam through the ring in stable orbits. The six elements (deflectors and mirrors) are placed on a common grounded plate-the tabletop. Here, we present the design, ion trajectory simulations, and results of the first test experiments demonstrating the successful room-temperature operation of Mini-Ring at background pressures of 10(-6)-10(-7) mbar. (c) 2008 American Institute of Physics.}",
    	doi = "{10.1063/1.2957609}",
    	article-number = "{075109}",
    	issn = "{0034-6748}",
    	unique-id = "{ISI:000258179400053}"
    }
    
  49. B Liu, N Haag, H Johansson, H T Schmidt, H Cederquist, Brondsted S Nielsen, H Zettergren, P Hvelplund, B Manil and B A Huber.
    Electron capture induced dissociation of nucleotide anions in water nanodroplets. JOURNAL OF CHEMICAL PHYSICS 128(7), 2008.
    DOI BibTeX

    @article{ ISI:000253336800043,
    	author = "Liu, B. and Haag, N. and Johansson, H. and Schmidt, H. T. and Cederquist, H. and Nielsen, S. Brondsted and Zettergren, H. and Hvelplund, P. and Manil, B. and Huber, B. A.",
    	title = "{Electron capture induced dissociation of nucleotide anions in water nanodroplets}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2008}",
    	volume = "{128}",
    	number = "{7}",
    	month = "{FEB 21}",
    	abstract = "{We have studied the outcome of collisions between the hydrated nucleotide anion adenosine 5(')-monophosphate (AMP) and sodium. Electron capture leads to hydrogen loss as well as water evaporation regardless of the initial number m of water molecules attached to the parent ion (m <= 16). The yield of dianions with microsecond lifetimes increases strongly with m, which is explained from dielectric screening of the two charges by the water nanodroplet. For comparison, collision induced dissociation results in water losses with no or very little damage of the AMP molecule itself.}",
    	doi = "{10.1063/1.2839597}",
    	article-number = "{075102}",
    	issn = "{0021-9606}",
    	unique-id = "{ISI:000253336800043}"
    }
    
  50. Stefan Rosen, Henning T Schmidt, Peter Reinhed, Daniel Fischer, Richard D Thomas, Henrik Cederquist, Leif Liljeby, Lars Bagge, Sven Leontein and Mikael Blom.
    Operating a triple stack microchannel plate-phosphor assembly for single particle counting in the 12-300 K temperature range. REVIEW OF SCIENTIFIC INSTRUMENTS 78(11), November 2007.
    DOI BibTeX

    @article{ ISI:000251325900012,
    	author = "Rosen, Stefan and Schmidt, Henning T. and Reinhed, Peter and Fischer, Daniel and Thomas, Richard D. and Cederquist, Henrik and Liljeby, Leif and Bagge, Lars and Leontein, Sven and Blom, Mikael",
    	title = "{Operating a triple stack microchannel plate-phosphor assembly for single particle counting in the 12-300 K temperature range}",
    	journal = "{REVIEW OF SCIENTIFIC INSTRUMENTS}",
    	year = "{2007}",
    	volume = "{78}",
    	number = "{11}",
    	month = "{NOV}",
    	abstract = "{An assembly consisting of a stack of three microchannel plates (MCPs) and a phosphor screen anode has been operated over the temperature range from 300 to 12 K. We report on measurements at 6.4 kHz (using an alpha source) and with dark counts only (15 Hz). Without any particle source, the MCP bias current decreased by a factor of 2.1x10(3) when the temperature was lowered from 300 to 12 K. Using the alpha source, and a photomultiplier tube (PMT) to monitor the phosphor screen anode, we first observed an increase in the decay time of the phosphor from 12 to 45 mu s when the temperature was decreased from 300 to 100 K while the decay time then decreased and reached a value of 5 mu s at 12 K. The pulse height distribution from the PMT was measured between 300 and 12 K and shows a spectrum typical for a MCP phosphor setup at 300 K and 12 K but is strongly degraded for intermediate temperatures. We conclude that the present MCP-phosphor detector assembly is well suited for position-sensitive particle counting operation at temperatures down to at least 12 K even for count rates beyond 6 kHz. This result is crucial and an important part of ongoing developments of new instrumentation for investigations of, e.g., interactions involving complex molecular ions with internal quantum state control. (C) 2007 American Institute of Physics.}",
    	doi = "{10.1063/1.2814030}",
    	article-number = "{113301}",
    	issn = "{0034-6748}",
    	unique-id = "{ISI:000251325900012}"
    }
    
  51. S Wethekam, H Winter, H Cederquist and H Zettergren.
    Neutralization of charged fullerenes during grazing scattering from a metal surface. PHYSICAL REVIEW LETTERS 99(3), 2007.
    DOI BibTeX

    @article{ ISI:000248194700056,
    	author = "Wethekam, S. and Winter, H. and Cederquist, H. and Zettergren, H.",
    	title = "{Neutralization of charged fullerenes during grazing scattering from a metal surface}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2007}",
    	volume = "{99}",
    	number = "{3}",
    	month = "{JUL 20}",
    	abstract = "{The neutralization of C-60(+) and C-60(2+) fullerenes with keV energies is studied for grazing scattering from a clean and flat Al(001) surface. From the measured shifts between the angular distributions for scattered projectiles of different incident charge, we derive image-charge interaction energies, which relate to the distances of electron transfer for C-60(+) and C-60(2+). These neutralization distances are in accord with a classical over-the-barrier model taking into account the image-charge effects of the Al target and the polarization of the fullerene.}",
    	doi = "{10.1103/PhysRevLett.99.037601}",
    	article-number = "{037601}",
    	issn = "{0031-9007}",
    	unique-id = "{ISI:000248194700056}"
    }
    
  52. Henning Zettergren, Henning T Schmidt, Peter Reinhed, Henrik Cederquist, Jens Jensen, Preben Hvelplund, Shigeo Tomita, Bruno Manil, Jimmy Rangama and Bernd A Huber.
    Stabilities of multiply charged dimers and clusters of fullerenes. JOURNAL OF CHEMICAL PHYSICS 126(22), 2007.
    DOI BibTeX

    @article{ ISI:000247247400015,
    	author = "Zettergren, Henning and Schmidt, Henning T. and Reinhed, Peter and Cederquist, Henrik and Jensen, Jens and Hvelplund, Preben and Tomita, Shigeo and Manil, Bruno and Rangama, Jimmy and Huber, Bernd A.",
    	title = "{Stabilities of multiply charged dimers and clusters of fullerenes}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2007}",
    	volume = "{126}",
    	number = "{22}",
    	month = "{JUN 14}",
    	abstract = "{The authors find even-odd variations as functions of r (<= 7) for multiple ionization of van der Waals dimers in slow Xe(30+)+{[}C(60)](2)({[}C(60)C(70)])->center dot+{[}C(60)](2)(r+)({[}C(60)C(70)](r+)) electron-transfer collisions. This even-odd behavior is in sharp contrast to the smooth one for fullerene monomers and may be related to even-odd effects in dimer ionization energies in agreement with results from an electrostatic model. The kinetic energy releases for dimer dissociations {[}predominantly yielding intact fullerenes {[}C(60)](2)(r+)-> C(60)(r1+)+C(60)(r2+) in the same (r1=r2) or nearby (r1=r2 +/- 1) charge states] are found to be low in comparison with the corresponding model results indicating that internal excitations of the separating (intact) fullerenes are important. Experimental appearance sizes for the heavier clusters of fullerenes {[}C(60)](n)(r+) (n > 3 and r=2-5) compare well with predictions from a new nearest-neighbor model assuming that r unit charges in {[}C(60)](n)(r+) are localized to r C(60) molecules such that the Coulomb energy of the system is minimized. The system is then taken to be stable if (i) two (singly) charged C(60) are not nearest neighbors and (ii) the r C(60)(+) molecules have binding energies to their neutral nearest neighbors which are larger than the repulsive energies for the (r-1) C(60)(+)-C(60)(+) pairs. Essential ingredients in the nearest-neighbor model are cluster geometries and the present results on dimer stabilities. (c) 2007 American Institute of Physics.}",
    	doi = "{10.1063/1.2743433}",
    	article-number = "{224303}",
    	issn = "{0021-9606}",
    	unique-id = "{ISI:000247247400015}"
    }
    
  53. H Zettergren, H T Schmidt, P Reinhed, H Cederquist, J Jensen, P Hvelplund, S Tomita, B Manil, J Rangama and B A Huber.
    {Even-odd effects in the ionization cross sections of [C-60](2) and [C60C70] dimers}. PHYSICAL REVIEW A 75(5), May 2007.
    DOI BibTeX

    @article{ ISI:000246890400009,
    	author = "Zettergren, H. and Schmidt, H. T. and Reinhed, P. and Cederquist, H. and Jensen, J. and Hvelplund, P. and Tomita, S. and Manil, B. and Rangama, J. and Huber, B. A.",
    	title = "{Even-odd effects in the ionization cross sections of {[}C-60](2) and {[}C60C70] dimers}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2007}",
    	volume = "{75}",
    	number = "{5}",
    	month = "{MAY}",
    	abstract = "{We report strong even-odd effects in multiple ionization yields of van der Waals dimers in slow Xe30++{[}C-60](2)({[}C60C70])->center dot center dot center dot+{[}C-60](2)(r+)({[}C60C70](r+)) electron-transfer collisions as functions of r <= 7. This behavior may be due to even-odd variations in the sequences of dimer ionization energies as calculated with an electrostatic model including an electrical fullerene-fullerene contact at the 19a(0) center-center separation in {[}C-60](2)(+). Prompt dissociations predominantly yield intact fullerenes {[}C-60](2)(r+)-> C-60(1)r++C-60(2)r+ in the same (r(1)=r(2), even r) or nearby (r(1)=r(2)+/- 1, odd r>1) charge states.}",
    	doi = "{10.1103/PhysRevA.75.051201}",
    	article-number = "{051201}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000246890400009}"
    }
    
  54. B Liu, Brondsted S Nielsen, P Hvelplund, H Zettergren, H Cederquist, B Manil and B A Huber.
    Collision-induced dissociation of hydrated adenosine monophosphate nucleotide ions: Protection of the ion in water nanoclusters. PHYSICAL REVIEW LETTERS 97(13), 2006.
    DOI BibTeX

    @article{ ISI:000240872700020,
    	author = "Liu, B. and Nielsen, S. Brondsted and Hvelplund, P. and Zettergren, H. and Cederquist, H. and Manil, B. and Huber, B. A.",
    	title = "{Collision-induced dissociation of hydrated adenosine monophosphate nucleotide ions: Protection of the ion in water nanoclusters}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2006}",
    	volume = "{97}",
    	number = "{13}",
    	month = "{SEP 29}",
    	abstract = "{Fragmentation of singly charged anions of adenosine 5'-monophosphate (AMP(-)) induced by collisions with neutral atoms (Ne, Na) has been studied at a collision energy of 50 keV. The experiments were performed with isolated AMP(-) as well as with AMP(-) anions nanosolvated in a cluster with a given number m of water molecules. In the first case, the dominant fragmentation channels concern the loss of adenine, PO3- and H2PO4-. In the latter, loss of water molecules becomes the dominating process, and the AMP(-) ion is fully protected when m is larger than similar to 13. The observed fragment distributions are well described with the model of an evaporative ensemble.}",
    	doi = "{10.1103/PhysRevLett.97.133401}",
    	article-number = "{133401}",
    	issn = "{0031-9007}",
    	unique-id = "{ISI:000240872700020}"
    }
    
  55. O Kamalou, B Manil, H Lebius, J Rangama, B A Huber, P Hvelplund, S Tomita, J Jensen, H T Schmidt, H Zettergren and H Cederquist.
    Fullerene collisions and clusters of fullerenes. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY 252(2):117-125, 2006.
    DOI BibTeX

    @article{ ISI:000237768900006,
    	author = "Kamalou, O. and Manil, B. and Lebius, H. and Rangama, J. and Huber, B. A. and Hvelplund, P. and Tomita, S. and Jensen, J. and Schmidt, H. T. and Zettergren, H. and Cederquist, H.",
    	title = "{Fullerene collisions and clusters of fullerenes}",
    	journal = "{INTERNATIONAL JOURNAL OF MASS SPECTROMETRY}",
    	year = "{2006}",
    	volume = "{252}",
    	number = "{2}",
    	pages = "{117-125}",
    	month = "{MAY 15}",
    	abstract = "{Electron capture processes were studied in glancing collisions between multiply charged C(60)(q+) ions and neutral C(60) molecules at low collision energies where nuclear stopping dominates the interaction (typical energy: 10 keV; velocity v = 0.024 a.u.). In addition, clusters of fullerenes were multiply ionized in collisions with highly charged slow ions and their fragmentation spectra were measured by applying multi-coincidence techniques in a second, separate experiment. Through the first experiment we show that non-fragmenting electron capture collisions do not produce free electrons in C(60)(q+)-C(60) collisions (q = 1-5), i.e., the cross sections for transfer ionization processes are negligible in this charge state regime. This is in contrast to the case of atomic projectile ions where transfer ionization processes, as e.g., C(q+) + C(60) -> C((q-r)+) + C(60)(r+) -> C((q-r+1)+) + C(60)(r+) +e(-), are strong for q > 2. These results are rationalized by means of the classical over-the-barrier model for electron transfer between two C(60) molecules, or between an atomic ion and a C(60) molecule, where the molecules are modeled as conducting spheres. Further, the same model may also be used as a basis for understanding the present observations of limitations in the maximum numbers of charges, which might be transferred in non-fragmenting C(60)(q+)-C(60) collisions (q/2 for even q and (q + 1)/2 for odd q) and in C(q+)-C(60) collision (here up to q charges may be transferred). In the same experiment, we have further measured scattering angles, theta, and energy losses, epsilon, for the fullerene projectiles in C(60)(q+)-C(60) collisions and we have found low values for both theta and epsilon, which, however, increase with the number of C(2)-units lost from the projectile fullerene in electron capture collisions. The critical distances for electron transfer which are deduced from the C(60)(q+)-C(60) collision experiment and the Zettergren model are then used to explain the high charge mobility between the individual C(60) molecules in charged (C(60))(n) van der Waal's clusters of fullerenes, which we observe in the second experiment. (C) 2006 Elsevier BX All rights reserved.}",
    	doi = "{10.1016/j.ijms.2005.12.054}",
    	issn = "{1387-3806}",
    	unique-id = "{ISI:000237768900006}"
    }
    
  56. H Zettergren, P Reinhed, K Stochkel, HT Schmidt, H Cederquist, J Jensen, S Tomita, SB Nielsen, P Hvelplund, B Manil, J Rangama and BA Huber.
    Fragmentation and ionization of C-70 and C-60 by slow ions of intermediate charge. EUROPEAN PHYSICAL JOURNAL D 38(2):299-306, May 2006.
    DOI BibTeX

    @article{ ISI:000236841000009,
    	author = "Zettergren, H and Reinhed, P and Stochkel, K and Schmidt, HT and Cederquist, H and Jensen, J and Tomita, S and Nielsen, SB and Hvelplund, P and Manil, B and Rangama, J and Huber, BA",
    	title = "{Fragmentation and ionization of C-70 and C-60 by slow ions of intermediate charge}",
    	journal = "{EUROPEAN PHYSICAL JOURNAL D}",
    	year = "{2006}",
    	volume = "{38}",
    	number = "{2}",
    	pages = "{299-306}",
    	month = "{MAY}",
    	abstract = "{We have measured total and coincident (with outgoing charge-state analyzed projectiles) ionization and fragmentation spectra of C-60 and C-70 following collisions with Xe4+ and Kr4+ at v = 0.06 a.u. Intact positive fullerene ions in charge states up to five (C-60(5+) and C-70(5+)) are produced with both projectiles and for Kr4++C-70 collisions we even observe a small C-70(6+) peak. The C-60/70-2m(3+) (m=1-7) intensity distributions are predominantly associated with the stabilization of three electrons on the projectile (s=3) and are significantly different for Xe4+- and Kr4+-projectiles. On the other hand, we find remarkable similarities in the C-3(+)-C-11(+) multi-fragmentation pattern regardless of projectile species (mass) although they are associated with closer encounters in which the projectile is fully neutralized (s=4). Simple Monte Carlo calculations of nuclear and electronic loss processes show that both these contributions are very similar in glancing Xe4++C-60 and Kr4++C-60 collisions, suggesting that frontal (and more violent) collisions are strongly suppressed under the present experimental conditions. Nevertheless it is surprising that the more distant collisions (s=3) are projectile mass dependent, while the closer collisions (s=4) are not. This indicates that this simple approach (although it reproduces more advanced quantum mechanical calculations for slow collisions with singly charged atomic ions rather well) is not valid for a comprehensive description of the energy transfer processes in the present collision systems involving projectiles of higher charge states.}",
    	doi = "{10.1140/epjd/e2006-00005-7}",
    	issn = "{1434-6060}",
    	unique-id = "{ISI:000236841000009}"
    }
    
  57. D Fischer, K Stochkel, H Cederquist, H Zettergren, P Reinhed, R Schuch, A Kallberg, A Simonsson and H T Schmidt.
    Experimental separation of the Thomas charge-transfer process in high-velocity p-He collisions. PHYSICAL REVIEW A 73(5), May 2006.
    DOI BibTeX

    @article{ ISI:000237949300078,
    	author = "Fischer, D. and Stochkel, K. and Cederquist, H. and Zettergren, H. and Reinhed, P. and Schuch, R. and Kallberg, A. and Simonsson, A. and Schmidt, H. T.",
    	title = "{Experimental separation of the Thomas charge-transfer process in high-velocity p-He collisions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2006}",
    	volume = "{73}",
    	number = "{5}",
    	month = "{MAY}",
    	abstract = "{We present differential cross sections of electron capture in 7.5 MeV and 12.5 MeV proton-helium collisions. Complete experimental separations of the Thomas and the kinematic single electron capture processes in the two-dimensional He+ momentum distribution in the plane perpendicular to the fast ion beam have been achieved. We compare the resulting projectile angular differential cross section with the two most recent theoretical calculations and expose significant deviations.}",
    	doi = "{10.1103/PhysRevA.73.052713}",
    	article-number = "{052713}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000237949300078}"
    }
    
  58. S Tomita, JU Andersen, H Cederquist, B Concina, O Echt, JS Forster, K Hansen, BA Huber, P Hvelplund, J Jensen, B Liu, B Manil, L Maunoury, SB Nielsen, J Rangama, HT Schmidt and H Zettergren.
    Lifetimes of C-60(2-) and C-70(2-) dianions in a storage ring. JOURNAL OF CHEMICAL PHYSICS 124(2), 2006.
    DOI BibTeX

    @article{ ISI:000234607700027,
    	author = "Tomita, S and Andersen, JU and Cederquist, H and Concina, B and Echt, O and Forster, JS and Hansen, K and Huber, BA and Hvelplund, P and Jensen, J and Liu, B and Manil, B and Maunoury, L and Nielsen, SB and Rangama, J and Schmidt, HT and Zettergren, H",
    	title = "{Lifetimes of C-60(2-) and C-70(2-) dianions in a storage ring}",
    	journal = "{JOURNAL OF CHEMICAL PHYSICS}",
    	year = "{2006}",
    	volume = "{124}",
    	number = "{2}",
    	month = "{JAN 14}",
    	abstract = "{C-60(2-) and C-70(2-) dianions have been produced by electrospray of the monoanions and subsequent electron pickup in a Na vapor cell. The dianions were stored in an electrostatic ring and their decay by electron emission was measured up to 1 s after injection. While C-70(2-) ions are stable on this time scale, except for a small fraction of the ions which have been excited by gas collisions, most of the C-60(2-) ions decay on a millisecond time scale, with a lifetime depending strongly on their internal temperature. The results can be modeled as decay by electron tunneling through a Coulomb barrier, mainly from thermally populated triplet states about 120 meV above a singlet ground state. At times longer than about 100 ms, the absorption of blackbody radiation plays an important role for the decay of initially cold ions. The tunneling rates obtained from the modeling, combined with WKB estimates of the barrier penetration, give a ground-state energy 200 +/- 30 meV above the energy of the monoanion plus a free electron and a ground-state lifetime of the order of 20 s. (c) 2006 American Institute of Physics.}",
    	doi = "{10.1063/1.2155435}",
    	article-number = "{024310}",
    	issn = "{0021-9606}",
    	researcherid-numbers = "{Hansen, Klavs/J-1959-2012}",
    	unique-id = "{ISI:000234607700027}"
    }
    
  59. K Stochkel, O Eidem, H Cederquist, H Zettergren, P Reinhed, R Schuch, CL Cocke, SB Levin, VN Ostrovsky, A Kalberg, A Simonsson, J Jensen and HT Schmidt.
    Two-center interference in fast proton-H-2-electron transfer and excitation processes. PHYSICAL REVIEW A 72(5), November 2005.
    DOI BibTeX

    @article{ ISI:000233603400010,
    	author = "Stochkel, K and Eidem, O and Cederquist, H and Zettergren, H and Reinhed, P and Schuch, R and Cocke, CL and Levin, SB and Ostrovsky, VN and Kalberg, A and Simonsson, A and Jensen, J and Schmidt, HT",
    	title = "{Two-center interference in fast proton-H-2-electron transfer and excitation processes}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2005}",
    	volume = "{72}",
    	number = "{5}",
    	month = "{NOV}",
    	abstract = "{We present experimental evidence for a strong dependence on the angle between the molecular axis of H-2 and the direction of the incoming projectile (p) in the cross section for transfer excitation in fast p-H-2 collisions. For collision energies of 1.0 and 1.3 MeV we find good agreement between the observed data and an analytical expression based on a two-atomic-center description using Brinkman-Kramers amplitudes. This clearly shows that the observed angular dependence is a result of quantum mechanical interference and not a trivial geometrical effect.}",
    	doi = "{10.1103/PhysRevA.72.050703}",
    	article-number = "{050703}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000233603400010}"
    }
    
  60. B Manil, L Maunoury, J Jensen, H Cederquist, HT Schmidt, H Zettergren, P Hvelplund, S Tomita and BA Huber.
    Fragmentation of charged fullerene dimers: Kinetic energy release. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 235:419-424, July 2005.
    DOI BibTeX

    @article{ ISI:000230334400084,
    	author = "Manil, B and Maunoury, L and Jensen, J and Cederquist, H and Schmidt, HT and Zettergren, H and Hvelplund, P and Tomita, S and Huber, BA",
    	title = "{Fragmentation of charged fullerene dimers: Kinetic energy release}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{2005}",
    	volume = "{235}",
    	pages = "{419-424}",
    	month = "{JUL}",
    	note = "{12th International Conference on the Physics of Highly Charged Ions, Vilnius, LITHUANIA, SEP 06-11, 2004}",
    	abstract = "{We have performed an experimental study of highly charged clusters of fullerenes produced in slow collisions with highly charged ions. Collision products are analysed with respect to their mass to charge ratio and their initial kinectic energy by a linear time-of-flight mass spectrometer. An event-by-event data registration mode allows to study the correlation between the different detected fragments. In this paper, we focus on the kinetic energy releases (KER) in the fragmentation of charged dimers of fullerenes. The results are compared with theoretical values obtained from the conducting sphere model. (c) 2005 Elsevier B.V. All rights reserved.}",
    	doi = "{10.1016/j.nimb.2005.03.217}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:000230334400084}"
    }
    
  61. HT Schmidt, J Jensen, P Reinhed, R Schuch, K Stochkel, H Zettergren, H Cederquist, L Bagge, H Danared, A Kallberg, H Schmidt-Bocking and CL Cocke.
    Recoil-ion momentum distributions for transfer ionization in fast proton-He collisions. PHYSICAL REVIEW A 72(1), July 2005.
    DOI BibTeX

    @article{ ISI:000230887300093,
    	author = "Schmidt, HT and Jensen, J and Reinhed, P and Schuch, R and Stochkel, K and Zettergren, H and Cederquist, H and Bagge, L and Danared, H and Kallberg, A and Schmidt-Bocking, H and Cocke, CL",
    	title = "{Recoil-ion momentum distributions for transfer ionization in fast proton-He collisions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2005}",
    	volume = "{72}",
    	number = "{1}",
    	month = "{JUL}",
    	abstract = "{We present high-luminosity experimental investigations of the transfer ionization (TI:p+He -> H-0+He2++e(-)) process in collisions between fast protons and neutral helium atoms in the earlier inaccessibly high-energy range 1.4-5.8 MeV. The protons were stored in the heavy-ion storage and cooler ring CRYRING, where they intersected a narrow supersonic helium gas jet. We discuss the longitudinal recoil-ion momentum distribution, as measured by means of cold-target recoil-ion momentum spectroscopy and find that this distribution splits into two completely separated peaks at the high end of our energy range. These separate contributions are discussed in terms of the earlier proposed Thomas TI (TTI) and kinematic TI mechansims. The cross section of the TTI process is found to follow a sigma proportional to v(-b) dependence with b=10.78 +/- 0.27 in accordance with the expected v(-11) asymptotic behavior. Further, we discuss the probability for shake-off accompanying electron transfer and the relation of this TI mechanism to photodouble ionization. Finally the influence of the initial-state electron velocity distribution on the TTI process is discussed.}",
    	doi = "{10.1103/PhysRevA.72.012713}",
    	article-number = "{012713}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000230887300093}"
    }
    
  62. H Schmidt-Bocking, MS Schoffler, T Jahnke, A Czasch, V Mergel, L Schmidt, R Dorner, O Jagutzki, M Hattass, T Weber, E Weigold, HT Schmidt, R Schuch, H Cederquist, Y Demkov, C Whelan, A Godunov and J Walters.
    Many-particle fragmentation processes in atomic and molecular physics - new insight into the world of correlation. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 233:3-11, May 2005.
    DOI BibTeX

    @article{ ISI:000230063600003,
    	author = "Schmidt-Bocking, H and Schoffler, MS and Jahnke, T and Czasch, A and Mergel, V and Schmidt, L and Dorner, R and Jagutzki, O and Hattass, M and Weber, T and Weigold, E and Schmidt, HT and Schuch, R and Cederquist, H and Demkov, Y and Whelan, C and Godunov, A and Walters, J",
    	title = "{Many-particle fragmentation processes in atomic and molecular physics - new insight into the world of correlation}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{2005}",
    	volume = "{233}",
    	pages = "{3-11}",
    	month = "{MAY}",
    	note = "{8th Workshop on Fast Ion-Atom Collisions, Debrecen, HUNGARY, SEP 01-03, 2004}",
    	abstract = "{Correlated many-particle dynamics in Coulombic systems, which is one of the unsolved fundamental problems in AMO-physics, can now be experimentally approached with so far unprecedented completeness and precision. The recent development of the COLTRIMS technique (COLd Target Recoil Ion Momentum Spectroscopy) provides a coincident multi-fragment imaging technique for eV and sub-eV fragment detection. In its completeness it is as powerful as the bubble chamber in high energy physics. In recent benchmark experiments quasi snapshots (duration as short as an attosecond) of the correlated dynamics between electrons and nuclei have been made for atomic and molecular objects. This new imaging technique has opened a powerful observation window into the hidden world of many-particle dynamics. (c) 2005 Published by Elsevier B.V.}",
    	doi = "{10.1016/j.nimb.2005.03.079}",
    	issn = "{0168-583X}",
    	researcherid-numbers = "{Schoeffler, Markus/B-6261-2008 Godunov, Alexander/G-4266-2011 Doerner, Reinhard/A-5340-2008}",
    	orcid-numbers = "{Doerner, Reinhard/0000-0002-3728-4268}",
    	unique-id = "{ISI:000230063600003}"
    }
    
  63. HT Schmidt, A Fardi, J Jensen, P Reinhed, R Schuch, K Stochkel, H Zettergren, H Cederquist and CL Cocke.
    Transfer ionization in p+He collisions. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 233:43-47, May 2005.
    DOI BibTeX

    @article{ ISI:000230063600008,
    	author = "Schmidt, HT and Fardi, A and Jensen, J and Reinhed, P and Schuch, R and Stochkel, K and Zettergren, H and Cederquist, H and Cocke, CL",
    	title = "{Transfer ionization in p+He collisions}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{2005}",
    	volume = "{233}",
    	pages = "{43-47}",
    	month = "{MAY}",
    	note = "{8th Workshop on Fast Ion-Atom Collisions, Debrecen, HUNGARY, SEP 01-03, 2004}",
    	abstract = "{Using the unique combination of the high-quality ion beams available in the heavy-ion storage ring CRYRING at the Manne Siegbahn Laboratory, Stockholm and our COLTRIMS (cold target recoil-ion-momentum spectroscopy) setup with a pulsed extraction system we have investigated the recoil-ion-momentum distributions for transfer ionization in p-He collisions at energies up to 5.8 MeV. This technique allows us to determine the separate contribution to the cross section from the Thomas p-e-e scattering mechanism. Unlike the situation at lower collision energies we find that the cross section follows the expected asymptotic v(-11) scaling. (c) 2005 Published by Elsevier B.V.}",
    	doi = "{10.1016/j.nimb.2005.03.084}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:000230063600008}"
    }
    
  64. L Maunoury, B Manil, J Rangama, H Lebius, BA Huber, JY Pacquet, R Leroy, UV Pedersen, P Hvelplund, J Jensen, S Tomita, H Zettergren, HT Schmidt, H Cederquist and F Gustavo.
    Ion beams of carbon clusters and multiply charged fullerenes produced with electron cyclotron resonance ion sources. REVIEW OF SCIENTIFIC INSTRUMENTS 76(5), May 2005.
    DOI BibTeX

    @article{ ISI:000229064300015,
    	author = "Maunoury, L and Manil, B and Rangama, J and Lebius, H and Huber, BA and Pacquet, JY and Leroy, R and Pedersen, UV and Hvelplund, P and Jensen, J and Tomita, S and Zettergren, H and Schmidt, HT and Cederquist, H and Gustavo, F",
    	title = "{Ion beams of carbon clusters and multiply charged fullerenes produced with electron cyclotron resonance ion sources}",
    	journal = "{REVIEW OF SCIENTIFIC INSTRUMENTS}",
    	year = "{2005}",
    	volume = "{76}",
    	number = "{5}",
    	month = "{MAY}",
    	abstract = "{The production of carbon cluster ions by injecting C-60 fullerene vapor into different electron cyclotron resonance (ECR) ion sources (MONO1001/2.45 GHz and CAPRICE/14 GHz) is described. The extracted ion mass spectra show a bimodal distribution, well known from collisions between electrons or ions and fullerenes. In addition to small carbon clusters and even-numbered fullerene ions, odd-numbered clusters with (n > 30) are detected with low intensities. In particular, we have analyzed the mass spectra as a function of the rf power applied to the ECR plasma. Optimum power values are found for the production of individual carbon cluster ions, which increase with decreasing cluster size. Whereas at low power the production of fullerene ions dominates, the intensity of the very small carbon clusters is found to strongly increase with the injected power. This difference in the power dependence is used to vary and to determine the beam composition for ions with identical mass/charge ratios. (c) 2005 American Institute of Physics.}",
    	doi = "{10.1063/1.1900663}",
    	article-number = "{053304}",
    	issn = "{0034-6748}",
    	unique-id = "{ISI:000229064300015}"
    }
    
  65. JU Andersen, H Cederquist, JS Forster, BA Huber, P Hvelplund, J Jensen, B Liu, B Manil, L Maunoury, SB Nielsen, UV Pedersen, J Rangama, HT Schmidt, S Tomita and H Zettergren.
    Photodissociation of protonated amino acids and peptides in an ion storage ring. Determination of Arrhenius parameters in the high-temperature limit. PHYSICAL CHEMISTRY CHEMICAL PHYSICS 6(10):2676-2681, 2004.
    DOI BibTeX

    @article{ ISI:000222182100018,
    	author = "Andersen, JU and Cederquist, H and Forster, JS and Huber, BA and Hvelplund, P and Jensen, J and Liu, B and Manil, B and Maunoury, L and Nielsen, SB and Pedersen, UV and Rangama, J and Schmidt, HT and Tomita, S and Zettergren, H",
    	title = "{Photodissociation of protonated amino acids and peptides in an ion storage ring. Determination of Arrhenius parameters in the high-temperature limit}",
    	journal = "{PHYSICAL CHEMISTRY CHEMICAL PHYSICS}",
    	year = "{2004}",
    	volume = "{6}",
    	number = "{10}",
    	pages = "{2676-2681}",
    	month = "{MAY 21}",
    	abstract = "{We have measured the time dependence of the fragmentation of protonated amino acids and peptides upon UV excitation in an electrostatic ion storage ring. After absorption of a 266 nm photon, protonated Trp (TrpH(+)) has a lifetime of 10-20 mus but also a component with a millisecond lifetime is present. The long lifetime may be due to fluorescence, which leads to ions with lower excitation energy, or to the decay of the Trp(+.) radical cation formed after prompt hydrogen loss in the laser interaction region. Only one component with a lifetime of about 10 mus was detected for TyrH(+). The lifetime of photoexcited PheH(+) is even shorter with an upper limit of a few microseconds. For the singly protonated tripeptides (LysTrpLysH(+) and LysTyrLysH(+)), the decay curves are found to consist of a single component that can be reproduced with an assumption of statistical decay after equilibration of the photon energy among all vibrational modes. The rate constant is expressed in the Arrhenius form in terms of the microcanonical temperature, and the decay rate is obtained by integration over the energy distribution, which has a spread corresponding to the canonical energy distribution at room temperature. The resulting deviation from exponential decay makes it possible to determine the decay parameters from a measurement at a single photon wavelength. Activation energies of E(a), 1.24 +/- 0.07 and 1.5 +/- 0.4 eV were determined for LysTrpLysH(+) and LysTyrLysH(+), respectively, with pre-exponential factors of A(d) = 10(11.1+/-0.5) and 10(12.9+/-2.6) s(-1).}",
    	doi = "{10.1039/b316845j}",
    	issn = "{1463-9076}",
    	unique-id = "{ISI:000222182100018}"
    }
    
  66. J Jensen, H Zettergren, HT Schmidt, H Cederquist, S Tomita, SB Nielsen, J Rangama, P Hvelplund, B Manil and BA Huber.
    Ionization of C-70 and C-60 molecules by slow highly charged ions: A comparison. PHYSICAL REVIEW A 69(5), May 2004.
    DOI BibTeX

    @article{ ISI:000221813700102,
    	author = "Jensen, J and Zettergren, H and Schmidt, HT and Cederquist, H and Tomita, S and Nielsen, SB and Rangama, J and Hvelplund, P and Manil, B and Huber, BA",
    	title = "{Ionization of C-70 and C-60 molecules by slow highly charged ions: A comparison}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2004}",
    	volume = "{69}",
    	number = "{5}",
    	month = "{MAY}",
    	abstract = "{We have studied collisions between slow highly charged ions and pure C-70 and C-60 molecular targets, and report on measurements of target ionization and fragmentation in electron transfer processes. The intensity distributions in the fragmentation spectra for C-60 and C-70 are rather similar, indicating that similar roles are played by evaporation (neutral C-2 emission) and fission processes (charged particle emission) in the two systems. For C-70, intact molecular ions are formed in charge states up to 10+, while the maximum charge state for C-60 molecules is 9+ following collisions with Xe23+ at 69 keV. The kinetic-energy releases measured for asymmetric fission of C-70 ions (C-70(r+)-->C-68((r-1))+C-2(+)) are mostly close to the corresponding ones for C-60, while both sets of results are significantly lower than those reported for electron-impact ionization studies of C-60 and C-70. Kinetic-energy releases and fission barrier heights are estimated for C-60 and C-70 ions using an electrostatic model. An increased intensity of the higher charge states of C-70 ions is observed compared to the C-60 case, which most likely is due to a larger number of degrees of freedom on which the internal excitation energy may be distributed.}",
    	doi = "{10.1103/PhysRevA.69.053203}",
    	article-number = "{053203}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000221813700102}"
    }
    
  67. L Maunoury, JU Andersen, H Cederquist, BA Huber, P Hvelplund, R Leroy, B Manil, JY Pacquet, UV Pedersen, J Rangamma and S Tomita.
    MONO1001: A source for singly charged ions applied to the production of multicharged fullerene beams. REVIEW OF SCIENTIFIC INSTRUMENTS 75(5, Part 2):1884-1887, May 2004.
    DOI BibTeX

    @article{ ISI:000221872500150,
    	author = "Maunoury, L and Andersen, JU and Cederquist, H and Huber, BA and Hvelplund, P and Leroy, R and Manil, B and Pacquet, JY and Pedersen, UV and Rangamma, J and Tomita, S",
    	title = "{MONO1001: A source for singly charged ions applied to the production of multicharged fullerene beams}",
    	journal = "{REVIEW OF SCIENTIFIC INSTRUMENTS}",
    	year = "{2004}",
    	volume = "{75}",
    	number = "{5, Part 2}",
    	pages = "{1884-1887}",
    	month = "{MAY}",
    	note = "{10th International Conference on Ion Sources, Dubna, RUSSIA, SEP 08-13, 2003}",
    	organization = "{Joint Inst Nucl Res}",
    	abstract = "{The present article reports on a recent study of the production of multiply charged fullerene beams based on an electron cyclotron resonance (ECR) ion source (ECRIS). As collision studies in fundamental physics are demanding intense beams of multiply charged ions of small molecules, clusters, and particularly of fullerenes, we have further developed the ion source ECRIS MONO1000 {[}P. Jardin et al., Rev. Sci. Instrum. 73, 789 (2002)], originally devoted to produce singly charged ions, towards the production of multiply charged fullerene beams. In this article, the test measurements performed at the Electrostatic Ion Storage Ring Arhus rf power (ELISA) facility will be described. Typical mass spectra (from pure C-60 and C-70 powder) will be shown and the influence of several source parameters (rf power, support gas, gas pressure,...) will be discussed specifying the conditions necessary for an optimum ion source operation. (C) 2004 American Institute of Physics.}",
    	doi = "{10.1063/1.1699518}",
    	issn = "{0034-6748}",
    	unique-id = "{ISI:000221872500150}"
    }
    
  68. H Zettergren, J Jensen, HT Schmidt and H Cederquist.
    Electrostatic model calculations of fission barriers for fullerene ions. EUROPEAN PHYSICAL JOURNAL D 29(1):63-68, April 2004.
    DOI BibTeX

    @article{ ISI:000221058100010,
    	author = "Zettergren, H and Jensen, J and Schmidt, HT and Cederquist, H",
    	title = "{Electrostatic model calculations of fission barriers for fullerene ions}",
    	journal = "{EUROPEAN PHYSICAL JOURNAL D}",
    	year = "{2004}",
    	volume = "{29}",
    	number = "{1}",
    	pages = "{63-68}",
    	month = "{APR}",
    	abstract = "{We present model calculations of kinetic energy releases and fission barriers in asymmetric fission of C-60(r+) ions, using a simple electrostatic model where the fragments are treated as conducting spheres. The kinetic energy releases are calculated using two different approaches for deducing the radii of the spheres. Both approaches give results in qualitative agreement with experimental results. The fission barriers, oil the other hand, depend strongly on the model radii and the activation energies for neutral fragment emission. A comparison between the model calculations shows that the choice of the finite size of the smaller fragments become important as r increases and have large influences on the prediction for the C-60(r+) stability limit. The competition between neutral (evaporation) and charged-fragment emission (fission) are discussed within a static over-the-barrier model for electron transfer between conducting spheres.}",
    	doi = "{10.1140/epjd/e2004-00006-6}",
    	issn = "{1434-6060}",
    	unique-id = "{ISI:000221058100010}"
    }
    
  69. Reinhold Schuch, Henrik Cederquist, Mats Larsson, Eva Lindroth, Sven Mannervik and Henning Schmidt.
    The XXIII International Conference on Photonic, Electronic and Atomic Collisions (23rd ICPEAC) - 23-29 July 2003, Stockholm, Sweden. PHYSICA SCRIPTA T110:7, 2004.
    DOI BibTeX

    @article{ ISI:000204271600001,
    	author = "Schuch, Reinhold and Cederquist, Henrik and Larsson, Mats and Lindroth, Eva and Mannervik, Sven and Schmidt, Henning",
    	title = "{The XXIII International Conference on Photonic, Electronic and Atomic Collisions (23rd ICPEAC) - 23-29 July 2003, Stockholm, Sweden}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{2004}",
    	volume = "{T110}",
    	pages = "{7}",
    	doi = "{10.1088/0031-8949/2004/T110/E02}",
    	issn = "{0031-8949}",
    	unique-id = "{ISI:000204271600001}"
    }
    
  70. B Manil, L Maunoury, BA Huber, J Jensen, HT Schmidt, H Zettergren, H Cederquist, S Tomita and P Hvelplund.
    Highly charged clusters of fullerenes: Charge mobility and appearance sizes. PHYSICAL REVIEW LETTERS 91(21), 2003.
    DOI BibTeX

    @article{ ISI:000186757000035,
    	author = "Manil, B and Maunoury, L and Huber, BA and Jensen, J and Schmidt, HT and Zettergren, H and Cederquist, H and Tomita, S and Hvelplund, P",
    	title = "{Highly charged clusters of fullerenes: Charge mobility and appearance sizes}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2003}",
    	volume = "{91}",
    	number = "{21}",
    	month = "{NOV 21}",
    	abstract = "{Clusters of fullerenes (C-60,C-70)(n) are produced in a gas aggregation source and are multiply ionized in collisions with highly charged Xe-20+,Xe-30+ ions. Their stabilities and decay processes are analyzed with high-resolution time-of-flight mass spectrometry. Fullerene clusters in charge states up to q=5 have been observed and appearance sizes are found to be as small as n(app)=5, 10, 21, and 33 for q=2, 3, 4, and 5, respectively. The analysis of the multicoincident fragmentation spectra indicates a high charge mobility. This is in contrast to charge localization effects which have been reported for Ar-n(q+) rare gas clusters. Clusters of fullerenes are found to be conducting when multiply charged.}",
    	doi = "{10.1103/PhysRevLett.91.215504}",
    	article-number = "{215504}",
    	issn = "{0031-9007}",
    	unique-id = "{ISI:000186757000035}"
    }
    
  71. JU Andersen, H Cederquist, JS Forster, BA Huber, P Hvelplund, J Jensen, B Liu, B Manil, L Maunoury, SB Nielsen, UV Pedersen, HT Schmidt, S Tomita and H Zettergren.
    Power-law decay of collisionally excited amino acids and quenching by radiative cooling. EUROPEAN PHYSICAL JOURNAL D 25(2):139-148, August 2003.
    DOI BibTeX

    @article{ ISI:000184935300005,
    	author = "Andersen, JU and Cederquist, H and Forster, JS and Huber, BA and Hvelplund, P and Jensen, J and Liu, B and Manil, B and Maunoury, L and Nielsen, SB and Pedersen, UV and Schmidt, HT and Tomita, S and Zettergren, H",
    	title = "{Power-law decay of collisionally excited amino acids and quenching by radiative cooling}",
    	journal = "{EUROPEAN PHYSICAL JOURNAL D}",
    	year = "{2003}",
    	volume = "{25}",
    	number = "{2}",
    	pages = "{139-148}",
    	month = "{AUG}",
    	abstract = "{We have investigated the time dependence of the fragmentation of protonated amino acids stored at 22 keV in the electrostatic ring ELISA. The ions were produced in an electrospray source and after bunching in a quadrupole trap they were excited by collisions in a Ne gas. As in earlier studies of metal clusters and fullerenes produced in ``hot{''} ion sources we find that the dissociation of metastable molecules follows approximately a 1/t decay law until a time tau after which the yield falls off much more rapidly. We interpret this reduction as a result of radiative cooling with a characteristic cooling time, tau(c) similar or equal to G(T), where G is the magnitude of the exponent in an Arrhenius expression for the rate of the dominant fragmentation process. The values of tau obtained from fits to the data are in the range 9-17 ms corresponding to cooling times of a few hundred milliseconds, in good accord with the expected rate of cooling by emission from IR-active vibrations. The power-law behaviour for t < tau varies somewhat between the different amino acids, with powers between -0.9 and -1.1. We argue that this may be due to a competition between fragmentation channels with different Arrhenius parameters.}",
    	doi = "{10.1140/epjd/e2003-00093-9}",
    	issn = "{1434-6060}",
    	unique-id = "{ISI:000184935300005}"
    }
    
  72. H Cederquist, J Jensen, HT Schmidt, H Zettergren, S Tomita, BA Huber and B Manil.
    Barriers for asymmetric fission of multiply charged C-60 fullerenes. PHYSICAL REVIEW A 67(6), June 2003.
    DOI BibTeX

    @article{ ISI:000183915200077,
    	author = "Cederquist, H and Jensen, J and Schmidt, HT and Zettergren, H and Tomita, S and Huber, BA and Manil, B",
    	title = "{Barriers for asymmetric fission of multiply charged C-60 fullerenes}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2003}",
    	volume = "{67}",
    	number = "{6}",
    	month = "{JUN}",
    	abstract = "{We have measured kinetic energy releases in asymmetric fission, C-60(r+)-->C-58((r-1)+)+C-2(+) (r=6-9) and evaporation C-60(r+)-->C-58(r+)+C-2 (r=2,3), following multiple-electron removal from C-60 in He2+ and Xe17+ collisions at 3q keV (q=2,17). We used the recoil-ion momentum technique and limited the initial momentum distribution of the target molecules by collimation of the effusive C-60 jet. This yielded a resolution of 3 meV for the final kinetic energies of the charged C-58 fragments, mapped out as two-dimensional position distributions at the end of a linear time-of-flight mass spectrometer. The present results for asymmetric fission are in agreement with earlier ones deduced from time-of-flight C-2(+) peak-shape and sector-field C-58((r-1)+)-energy analysis. Model calculations treating C-58((r-1)+) and C-2(+) as conducting spheres indicate that the autocharge-transfer process, which has been proposed to link asymmetric fission to neutral C-2 emission, most likely is inactive for all r. Using a charge-independent activation energy for C-2 emission from C-60(r+) of E-a=10 eV, we deduce fission barriers indicating lower (semiempirical) and upper (model) C-60(r+)-stability limits of r=11 and r=18, respectively.}",
    	doi = "{10.1103/PhysRevA.67.062719}",
    	article-number = "{062719}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000183915200077}"
    }
    
  73. H Schmidt-Bocking, V Mergel, R Dorner, CL Cocke, O Jagutzki, L Schmidt, T Weber, HJ Ludde, E Weigold, J Berakdar, H Cederquist, HT Schmidt, R Schuch and AS Kheifets.
    Revealing the non-s(2) contributions in the momentum wave function of ground-state He. EUROPHYSICS LETTERS 62(4):477-483, May 2003.
    DOI BibTeX

    @article{ ISI:000182961600004,
    	author = "Schmidt-Bocking, H and Mergel, V and Dorner, R and Cocke, CL and Jagutzki, O and Schmidt, L and Weber, T and Ludde, HJ and Weigold, E and Berakdar, J and Cederquist, H and Schmidt, HT and Schuch, R and Kheifets, AS",
    	title = "{Revealing the non-s(2) contributions in the momentum wave function of ground-state He}",
    	journal = "{EUROPHYSICS LETTERS}",
    	year = "{2003}",
    	volume = "{62}",
    	number = "{4}",
    	pages = "{477-483}",
    	month = "{MAY}",
    	abstract = "{The correlated Tunneling Transfer Ionization (TuTI) channel in fast 4-body processes p + He --> H-0 + He2+ + e is utilized to probe the highly correlated asymptotic parts of the He ground-state momentum space wave function. In this reaction, predominantly at large nuclear impact parameters, one electron in the He ground state is captured by the proton by tunneling through the two-center barrier when electron and proton velocity vectors resonantly match. The measured 3-particle final-state momentum distributions show characteristic features that we trace back to the highly correlated non-s(2) components of the He ground-state momentum wave function. This conclusion is supported by a simple heuristic model.}",
    	doi = "{10.1209/epl/i2003-00378-5}",
    	issn = "{0295-5075}",
    	researcherid-numbers = "{Kheifets, Anatoli/C-9131-2009 Doerner, Reinhard/A-5340-2008}",
    	orcid-numbers = "{Doerner, Reinhard/0000-0002-3728-4268}",
    	unique-id = "{ISI:000182961600004}"
    }
    
  74. J Bernard, S Martin, L Chen, H Cederquist, A Salmoun and R Bredy.
    A single ion (Arq+ q=1,3 or C-60(3+)) in a conic electrode electrostatic trap. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 205:196-200, May 2003.
    DOI BibTeX

    @article{ ISI:000183211200037,
    	author = "Bernard, J and Martin, S and Chen, L and Cederquist, H and Salmoun, A and Bredy, R",
    	title = "{A single ion (Arq+ q=1,3 or C-60(3+)) in a conic electrode electrostatic trap}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{2003}",
    	volume = "{205}",
    	pages = "{196-200}",
    	month = "{MAY}",
    	note = "{11th International Conference on the Physics of Highly Charged Ions (HCI 2002), CAEN, FRANCE, SEP 01-06, 2002}",
    	abstract = "{We report here an experiment concerning the operation of a conic electrode trap to study the decay of a single trapped ion (Arq+ with q = 1, 3 and C-60(3+)) in a time range up to 50 ms. Ions to be trapped are produced by collisions of slow highly charged ions (56 keV Ar8+) with Ar gas or a C-60 effusive gas jet. The operation of the trap is triggered by the coincident detection of a charge selected scattered projectile and the ejected electron number in order to select different recoil ion charges. The ion storage efficiency has been studied for one oscillation of the trapped ion as a function of the cone voltage. One of the final aims of these experiments is to measure on which time scale multiply charged clusters produced by impact of highly charged ions are stable. Since stability and lifetime of clusters are known to depend on their internal energy, we plan to vary this parameter by changing the initial projectile charge or/and by selecting different collision processes. (C) 2003 Elsevier Science B.V. All rights reserved.}",
    	doi = "{10.1016/S0168-583X(03)00553-6}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:000183211200037}"
    }
    
  75. J Jensen, H Zettergren, A Fardi, HT Schmidt and H Cederquist.
    Energy releases in the fission of multiply charged C-60 ions. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 205:643-650, May 2003.
    DOI BibTeX

    @article{ ISI:000183211200125,
    	author = "Jensen, J and Zettergren, H and Fardi, A and Schmidt, HT and Cederquist, H",
    	title = "{Energy releases in the fission of multiply charged C-60 ions}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{2003}",
    	volume = "{205}",
    	pages = "{643-650}",
    	month = "{MAY}",
    	note = "{11th International Conference on the Physics of Highly Charged Ions (HCI 2002), CAEN, FRANCE, SEP 01-06, 2002}",
    	abstract = "{We have studied electron-transfer and collision-induced fragmentation processes in collisions between slow highly charged ions and C-60 molecules. By using a position sensitive detector, located after a time-of-flight spectrometer, we obtain recoil energies of fragments resulting from post-collisional disintegration of multiply charged C-60 ions. We deduce kinetic energy releases (KERs) for the cases in which multiply charged C-60 ions emit either a single C-2(+) ion or a neutral C-2-unit. We find that C-58(4+) ions predominately are due to the emission of a neutral C-2 molecule. Model calculations of KER-values resulting from C-60(r+) ions emitting a C-2(+) ion are presented, and compared with the corresponding experimental results for C-60(r+) with 5 less than or equal to r less than or equal to 9 (C) 2003 Elsevier Science B.V. All rights reserved.}",
    	doi = "{10.1016/S0168-583X(03)00532-9}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:000183211200125}"
    }
    
  76. P Hvelplund, B Liu, SB Nielsen, S Tomita, H Cederquist, J Jensen, HT Schmidt and H Zettergren.
    Electron capture and loss by protonated peptides and proteins in collisions with C-60 and Na. EUROPEAN PHYSICAL JOURNAL D 22(1):75-79, January 2003.
    DOI BibTeX

    @article{ ISI:000180850000009,
    	author = "Hvelplund, P and Liu, B and Nielsen, SB and Tomita, S and Cederquist, H and Jensen, J and Schmidt, HT and Zettergren, H",
    	title = "{Electron capture and loss by protonated peptides and proteins in collisions with C-60 and Na}",
    	journal = "{EUROPEAN PHYSICAL JOURNAL D}",
    	year = "{2003}",
    	volume = "{22}",
    	number = "{1}",
    	pages = "{75-79}",
    	month = "{JAN}",
    	abstract = "{Electron capture and loss cross-sections have been measured for collisions between fast multiply charged peptide and protein ions {[}M+nH](n+) and Na or C-60. The ions were produced in an electrospray ion source (ESI) and accelerated to an energy of n x 50 keV. We find that the size of the cross-sections depend strongly on molecule size, ionization energy and projectile charge state n. For multiply charged ubiquitin projectiles, the cross-sections for electron capture are found to be several times larger With a Na target than with a C-60 target. This observation is qualitatively explained by means of an over-the-barrier model for electron transfer using metal-sphere descriptions for the electronic responses of the collision partners.}",
    	doi = "{10.1140/epjd/e2002-00220-2}",
    	issn = "{1434-6060}",
    	unique-id = "{ISI:000180850000009}"
    }
    
  77. HT Schmidt, A Fardi, R Schuch, SH Schwartz, H Zettergren, H Cederquist, L Bagge, H Danared, A Kallberg, J Jensen, KG Rensfelt, V Mergel, L Schmidt, H Schmidt-Bocking and CL Cocke.
    Double-to-single target ionization ratio for electron capture in fast p-He collisions. PHYSICAL REVIEW LETTERS 89(16), 2002.
    DOI BibTeX

    @article{ ISI:000178384300010,
    	author = "Schmidt, HT and Fardi, A and Schuch, R and Schwartz, SH and Zettergren, H and Cederquist, H and Bagge, L and Danared, H and Kallberg, A and Jensen, J and Rensfelt, KG and Mergel, V and Schmidt, L and Schmidt-Bocking, H and Cocke, CL",
    	title = "{Double-to-single target ionization ratio for electron capture in fast p-He collisions}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{2002}",
    	volume = "{89}",
    	number = "{16}",
    	month = "{OCT 14}",
    	abstract = "{We have used the ion storage ring CRYRING and its internal gas-jet target and recoil-ion-momentum spectrometer to measure absolute cross sections for transfer ionization (TI: p+He-->H-0+He2++e(-)) in 2.5-4.5 MeV p-He collisions with separate Thomas (TTI) and kinematic (KTI) TI contributions. The probability for electron emission in kinematical capture decreases with increasing velocity and appears to approach the photoionization shakeoff value (1.63\%) {[}T. Aberg, Phys. Rev. A 2, 1726 (1970)]. The velocity dependence of the TTI cross section is consistent with the theoretically predicted v(-11) scaling {[}J. S. Briggs and K. Taulbjerg, J. Phys. B 12, 2565 (1979)].}",
    	doi = "{10.1103/PhysRevLett.89.163201}",
    	article-number = "{163201}",
    	issn = "{0031-9007}",
    	unique-id = "{ISI:000178384300010}"
    }
    
  78. H Zettergren, HT Schmidt, H Cederquist, J Jensen, S Tomita, P Hvelplund, H Lebius and BA Huber.
    Static over-the-barrier model for electron transfer between metallic spherical objects. PHYSICAL REVIEW A 66(3), September 2002.
    DOI BibTeX

    @article{ ISI:000178382500069,
    	author = "Zettergren, H and Schmidt, HT and Cederquist, H and Jensen, J and Tomita, S and Hvelplund, P and Lebius, H and Huber, BA",
    	title = "{Static over-the-barrier model for electron transfer between metallic spherical objects}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2002}",
    	volume = "{66}",
    	number = "{3}",
    	month = "{SEP}",
    	abstract = "{We present a static classical over-the-barrier model (OBM) for electron transfer between two isolated, infinitely conducting spheres with arbitrary and different electrical charges. This model is shown to be very useful for first estimates of single- and multiple-electron transfer cross sections in cluster-cluster collisions when the collision velocities are significantly lower than the typical target electron velocities. For faster collisions, more advanced models such as the dynamical OBM, or the time-dependent local density approximation (TDLDA) or the solutions of their semiclassical counterparts-the Vlasov equations have to be used. The latter two methods clearly provide the most detailed information on the electronic response, but they are also computationally very demanding and have, so far, only been used for collisions involving one cluster (and an atomic ion). We compare our static OBM results (in the limit in which one of the sphere radii approaches zero) with TDLDA and Vlasov calculations of cluster charging in Ar8+-Na-40 collisions at different velocities to demonstrate that the present static OBM is valid at sufficiently low velocities. The static OBM is then used in a comparison with experimental target charge state distributions in C-60(q+)-C-60 and Cq+-C-60 collisions at 0.01rootq and 0.06rootq v(0), respectively. Calculated electronic excitation of the projectile after two-electron transfer in C-60(4+)-C-60 collisions readily explains the recently observed suppression of the transfer ionization channel in this reaction. Finally, we model the total projectile electron loss and dissociation cross section in highly protonated Lysozyme-oxygen (Lys-H-9(9+)-O-2) collisions and make comparisons with recent experimental results at 0.01 v(0).}",
    	doi = "{10.1103/PhysRevA.66.032710}",
    	article-number = "{032710}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000178382500069}"
    }
    
  79. A Langereis, J Jensen, A Fardi, K Haghighat, H T Schmidt, S H Schwartz, H Zettergren and H Cederquist.
    Stabilization of electrons on Ar^q+ ions after slow collisions with C60. Phys. Rev. A 63:062725, May 2001.
    URL, DOI BibTeX

    @article{PhysRevA.63.062725,
    	title = "Stabilization of electrons on Ar^q+ ions after slow collisions with C60",
    	author = "Langereis, A. and Jensen, J. and Fardi, A. and Haghighat, K. and Schmidt, H. T. and Schwartz, S. H. and Zettergren, H. and Cederquist, H.",
    	journal = "Phys. Rev. A",
    	volume = 63,
    	issue = 6,
    	pages = 062725,
    	numpages = 7,
    	year = 2001,
    	month = "May",
    	doi = "10.1103/PhysRevA.63.062725",
    	url = "http://link.aps.org/doi/10.1103/PhysRevA.63.062725",
    	publisher = "American Physical Society"
    }
    
  80. HT Schmidt, H Cederquist, J Jensen and A Fardi.
    Conetrap: A compact electrostatic ion trap. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 173(4):523-527, February 2001.
    DOI BibTeX

    @article{ ISI:000166721500016,
    	author = "Schmidt, HT and Cederquist, H and Jensen, J and Fardi, A",
    	title = "{Conetrap: A compact electrostatic ion trap}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{2001}",
    	volume = "{173}",
    	number = "{4}",
    	pages = "{523-527}",
    	month = "{FEB}",
    	abstract = "{We have developed a very simple and compact fully electrostatic ion storage device. It consists of only three electrodes: two conical and one central cylindrical. This simple setup works as two focusing electrostatic mirrors forming a resonator-like structure and thereby confining the ions. We present the design and show the first test results demonstrating an ion-storage lifetime in the 100 ms-range at modest vacuum conditions. Storage lifetimes in the order of minutes are foreseen when UHV conditions are introduced. (C) 2001 Elsevier Science B.V. All rights reserved.}",
    	doi = "{10.1016/S0168-583X(00)00415-8}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:000166721500016}"
    }
    
  81. H Cederquist, P Hvelplund, H Lebius, HT Schmidt, S Tomita and BA Huber.
    Nonfragmenting charge transfer in slow peripheral C-60(q+)-C-60 collisions. PHYSICAL REVIEW A 63(2), February 2001.
    DOI BibTeX

    @article{ ISI:000166867900125,
    	author = "Cederquist, H and Hvelplund, P and Lebius, H and Schmidt, HT and Tomita, S and Huber, BA",
    	title = "{Nonfragmenting charge transfer in slow peripheral C-60(q+)-C-60 collisions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2001}",
    	volume = "{63}",
    	number = "{2}",
    	month = "{FEB}",
    	abstract = "{We have investigated electron transfer and fragmentation of C-60 molecules in slow (1q-2q keV) collisions with C-60(q+) projectiles (q = 2-5) and atomic Cq+ projectiles at somewhat higher velocities. While the latter give the characteristic fragment distributions the former only yield intact C-60(r+) target molecules. Further, the atomic carbon projectiles ionize the target C-60 up to their incident charges, r(max) = q, while the maximum target charges are limited to r(max) = Int{[}(q + 1)/2] for C-60(q+) projectiles. The latter results are explained by considering the energy minima for q charges distributed on the equipotential surfaces of two touching spheres.}",
    	doi = "{10.1103/PhysRevA.63.025201}",
    	article-number = "{025201}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000166867900125}"
    }
    
  82. SH Schwartz, A Fardi, K Haghighat, A Langereis, HT Schmidt and H Cederquist.
    Absolute and total electron-capture cross sections in slow Arq+-C-60 collisions. PHYSICAL REVIEW A 63(1), January 2001.
    BibTeX

    @article{ ISI:000166383000072,
    	author = "Schwartz, SH and Fardi, A and Haghighat, K and Langereis, A and Schmidt, HT and Cederquist, H",
    	title = "{Absolute and total electron-capture cross sections in slow Arq+-C-60 collisions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2001}",
    	volume = "{63}",
    	number = "{1}",
    	month = "{JAN}",
    	abstract = "{We present experimental absolute and total electron-capture cross sections for Arq+-C-60 (q = 4, 6, and 8-18) collisions at 3.3q keV. The absolute scale is based on the C-60 vapor pressure by Abrefah et al. {[}Appl. Phys. Lett. 60, 1313 (1992)], which together with the results of Mathews et al. {[}J. Phys. Chem. 96, 3566, (1992)] are the only possible choices among the many, widely dispersed, vapor pressures reported in the literature. In order to support this statement, we calculate total electron-capture cross sections modeling C-60 as a pointlike object and as an infinitely conducting sphere (ICS). These model results are shown to differ little, since polarization and finite-size effects are relatively unimportant for the distant collisions at which the outermost (first) electrons me transferred. We are thus able to use the semiempirical formula for absolute ion-atom cross sections by Selberg et nl. {[}Phys. Rev. A 54, 4127 (1996)], treating C-60 as a hypothetical atom with ionization potential I-1 = 7.6 eV, and the ICS model to define lower and upper bounds for the absolute cross-section scale. We find significant oscillations in the total electron-capture cross sections as functions of q.}",
    	article-number = "{013201}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000166383000072}"
    }
    
  83. J Opitz, H Lebius, S Tomita, BA Huber, PM Capelle, DB Montesquieu, AB Montesquieu, A Reinkoster, U Werner, HO Lutz, A Niehaus, M Benndorf, K Haghighat, HT Schmidt and H Cederquist.
    Electronic excitation in H+-C-60 collisions: Evaporation and ionization. PHYSICAL REVIEW A 62(2), August 2000.
    DOI BibTeX

    @article{ ISI:000088683400057,
    	author = "Opitz, J and Lebius, H and Tomita, S and Huber, BA and Capelle, PM and Montesquieu, DB and Montesquieu, AB and Reinkoster, A and Werner, U and Lutz, HO and Niehaus, A and Benndorf, M and Haghighat, K and Schmidt, HT and Cederquist, H",
    	title = "{Electronic excitation in H+-C-60 collisions: Evaporation and ionization}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2000}",
    	volume = "{62}",
    	number = "{2}",
    	month = "{AUG}",
    	abstract = "{We have studied energy transfer, fragmentation and ionization in collisions between protons and C-60 molecules. The collision energy is varied between 1 and 300 keV and we thus cover a velocity range from 0.2 to 3.5 atomic units. The distributions of intact and fragmented C-60 ions have been measured by means of time-of-flight mass spectrometry using pulsed beams or emitted electrons to clock the collision events. The processes leading to multiple ionization and evaporation of neutral dimers are analyzed as functions of the projectile velocity. In contrast to recent findings for He+-C-60 collisions by Schlatholter et al., our results show that the cross sections for ionization and evaporation first increase with velocity, have maxims at around 1-2 a.u., and decrease again for higher velocities. This velocity dependence closely resembles the one for the electronic stopping power indicating that electronic excitations are the main means of energy transfer to C-60 and that this energy is rapidly distributed among the vibrational degrees of freedom. This conclusion is supported by Monte Carlo calculations of nuclear and electronic energy loss for protons passing through and closely outside the C-60 cage.}",
    	doi = "{10.1103/PhysRevA.62.022705}",
    	article-number = "{022705}",
    	issn = "{1050-2947}",
    	researcherid-numbers = "{Werner, Udo/B-6109-2012}",
    	unique-id = "{ISI:000088683400057}"
    }
    
  84. H Cederquist, A Fardi, K Haghighat, A Langereis, HT Schmidt, H Schwartz, JC Levin, IA Sellin, H Lebius, B Huber, MO Larsson and P Hvelplund.
    Electronic response of C(60) in slow collisions with highly charged ions. PHYSICAL REVIEW A 61(2), February 2000.
    DOI BibTeX

    @article{ ISI:000085336900062,
    	author = "Cederquist, H and Fardi, A and Haghighat, K and Langereis, A and Schmidt, HT and Schwartz, H and Levin, JC and Sellin, IA and Lebius, H and Huber, B and Larsson, MO and Hvelplund, P",
    	title = "{Electronic response of C(60) in slow collisions with highly charged ions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{2000}",
    	volume = "{61}",
    	number = "{2}",
    	month = "{FEB}",
    	abstract = "{We present measurements of projectile angular differential cross sections, d sigma/d theta, and mean projectile energy gain or loss, Delta E(mean), as functions of the number s of electrons stabilized on the projectile in 16- and 26.4-keV Ar(8+) + C(60) --> Ar((8-s)+) + C(60)(r+) + (r-s)e(-) collisions. These results are discussed in view of two models of the electronic response of C(60). In the infinitely conducting sphere model the charge mobility is sufficiently high in order to average out all effects of localization of individual charge carriers. In the movable-hole model ``positive holes{''} are assumed to be localized as point charges in their equilibrium positions on the ``molecular surface{''} within thr times (down to 10(-16) s) between sequential over-the-barrier electron transfers. The two sets of predictions for theta are close for r less than or equal to 8, and for r less than or equal to 5 they are also in agreement with experimental results indicating ultrafast electronic response of ionized C(60). For r > 5, both models underestimate theta and therefore we have developed Monte Carlo calculations for close collisions with individual carbon atoms in C(60). The energy gain first increases with s, has a flat maximum around s = 4 and yields mean energy loss Delta E(mean) = -20 +/- 5 eV for s = 7. The measured fragmentation spectra theta(s) and Delta E(mean)(s) may be partially rationalized by combining each of the two smooth-sphere models with the Monte Carlo calculations for close collisions.}",
    	doi = "{10.1103/PhysRevA.61.022712}",
    	article-number = "{022712}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000085336900062}"
    }
    
  85. A Fardi, H Cederquist and HT Schmidt.
    Lifetime measurements for metastable He-like ions. HYPERFINE INTERACTIONS 127(1-4):247-250, 2000.
    DOI BibTeX

    @article{ ISI:000088519000037,
    	author = "Fardi, A and Cederquist, H and Schmidt, HT",
    	title = "{Lifetime measurements for metastable He-like ions}",
    	journal = "{HYPERFINE INTERACTIONS}",
    	year = "{2000}",
    	volume = "{127}",
    	number = "{1-4}",
    	pages = "{247-250}",
    	note = "{1st Euroconference on Atomic Physics at Accelerators (APAC 99), JOHANNES GUTENBERG UNIV, MAINZ, GERMANY, SEP 19-24, 1999}",
    	abstract = "{We present work in progress on the development of a new technique for measurements of mu s lifetimes of metastable excited states of He-like ions. The key element in this new technique is an electrostatic storage device for ions with keV energies.}",
    	doi = "{10.1023/A:1012603919983}",
    	issn = "{0304-3843}",
    	unique-id = "{ISI:000088519000037}"
    }
    
  86. K Hansen, JU Andersen, H Cederquist, C Gottrup, P Hvelplund, MO Larsson, VV Petrunin and HT Schmidt.
    Thermionic emission laser spectroscopy of stored C-60(-). EUROPEAN PHYSICAL JOURNAL D 9(1-4, SI):351-354, December 1999.
    DOI BibTeX

    @article{ ISI:000087317100068,
    	author = "Hansen, K and Andersen, JU and Cederquist, H and Gottrup, C and Hvelplund, P and Larsson, MO and Petrunin, VV and Schmidt, HT",
    	title = "{Thermionic emission laser spectroscopy of stored C-60(-)}",
    	journal = "{EUROPEAN PHYSICAL JOURNAL D}",
    	year = "{1999}",
    	volume = "{9}",
    	number = "{1-4, SI}",
    	pages = "{351-354}",
    	month = "{DEC}",
    	note = "{9th International Symposium of Small Particles and Inorganic Clusters, LAUSANNE, SWITZERLAND, SEP 01-05, 1998}",
    	organization = "{Swiss Fed Inst Technol, Dept Phys; Swiss Natl Sci Fdn; Swiss Acad Sci; Univ Lausanne; Schweizer Gesell Nanowissensch \& Nanotechn}",
    	abstract = "{Thermal emission of electrons from clusters is enhanced after the absorption of photons. We have used this process to measure the photoabsorption cross sections of hot C-60 anions in the visible and near-infrared part of the spectrum, using the ion storage ring ASTRID (Aarhus STorage RIng, Denmark).}",
    	doi = "{10.1007/s100530050454}",
    	issn = "{1434-6060}",
    	researcherid-numbers = "{Hansen, Klavs/J-1959-2012}",
    	unique-id = "{ISI:000087317100068}"
    }
    
  87. IA Sellin, JC Levin, HT Schmidt, SH Schwartz, A Fardi, K Haghighat, H Cederquist, L Liljeby and A Langereis.
    Absolute rates for radiative and non-radiative collisional deexcitation of metastable He+ (2s) in targets of variable polarizability. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 154(1-4):83-89, June 1999.
    DOI BibTeX

    @article{ ISI:000081399600012,
    	author = "Sellin, IA and Levin, JC and Schmidt, HT and Schwartz, SH and Fardi, A and Haghighat, K and Cederquist, H and Liljeby, L and Langereis, A",
    	title = "{Absolute rates for radiative and non-radiative collisional deexcitation of metastable He+ (2s) in targets of variable polarizability}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1999}",
    	volume = "{154}",
    	number = "{1-4}",
    	pages = "{83-89}",
    	month = "{JUN}",
    	note = "{7th Workshop on Fast Ion-Atom Collisions, DEBRECEN, HUNGARY, SEP 09-11, 1998}",
    	organization = "{BIOGAL Pharmaceut Factory; Chamber of Commerce \& Ind Hajdu-Bihar County; City Council Debrecen; County Council Hadju-Bihar; Hungarian Acad Sci, Budapest; Hungarian Sci Res Fdn, Budapest; Natl Comm Tech Dev, Budapest; Paks Nuclear Power Plant Co; Pfeiffer Vacuum Austria; univ Fdn, Debrecen}",
    	abstract = "{A method devised to measure separate absolute rates for deexcitation of metastable hydrogenic atoms and ions via radiative (R) and non-radiative (NR, e.g. Penning ionization (PI)) processes has first been applied to 6.6 keV He+(2s) collisions in Ar. Preliminary results of this new method were presented at the 1997 Budapest ISIAC conference by Henning Schmidt; subsequently, refined results have been published in the June 1998 issue of Phys. Rev. A, Rapid Communications, p. R4082. Additional data for the same projectiles have now been acquired for He and Xe targets. Preliminary comparisons of the R and NR rates for these new targets with the now final results for Ar as well as comparisons of the corresponding branching ratios are the primary focus of this paper. (C) 1999 Elsevier Science B.V. All rights reserved.}",
    	doi = "{10.1016/S0168-583X(99)00024-5}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:000081399600012}"
    }
    
  88. J Opitz, H Lebius, B Saint, S Jacquet, BA Huber and H Cederquist.
    Correlation studies of energy gain and fragmentation in ion-fullerene collisions. PHYSICAL REVIEW A 59(5):3562-3568, May 1999.
    DOI BibTeX

    @article{ ISI:000080383100056,
    	author = "Opitz, J and Lebius, H and Saint, B and Jacquet, S and Huber, BA and Cederquist, H",
    	title = "{Correlation studies of energy gain and fragmentation in ion-fullerene collisions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1999}",
    	volume = "{59}",
    	number = "{5}",
    	pages = "{3562-3568}",
    	month = "{MAY}",
    	abstract = "{Multi-ionization and fragmentation of C-60 fullerenes induced by collisions with Ar8+ ions have been studied in correlation with the energy gain and the number of electrons captured and stabilized by the projectile ion. The method allows us to separate electron capture reactions from transfer ionization processes and to determine the number (r) of active electrons. When one electron is stabilized on the projectile, the target ion C-60(r+) is left intact and the energy gain increases with the charge r, which ranges up to r = 4. The corresponding mean energy gain values for production of C-60(+) through C-60(4+) are used together with three different models for the electronic response of ionized C-60 in order to deduce semiempirical electron transfer distances for the first four electrons. A model with localized and mobile charges on the surface of the molecule gives a slightly better agreement with earlier measured recoil ion production cross sections than the metal sphere model or tin assumption with localized charges kept fixed closest to the projectile during the collisions. The mean energy gain depends on the number of stabilized electrons s. It increases between s = 1 and 2, then it stays constant, and finally decreases between s = 5 and 6. The energy distribution for s = 6 extends to the energy-loss side, which is attributed to close collisions causing a strong electronic excitation of C-60 {[}S1050-2947(99)05405-0].}",
    	doi = "{10.1103/PhysRevA.59.3562}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000080383100056}"
    }
    
  89. H Cederquist, A Fardi, K Haghighat, A Langereis, HT Schmidt and SH Schwartz.
    Highly charged ions colliding with atoms, surfaces and clusters. PHYSICA SCRIPTA T80A:46-51, 1999.
    DOI BibTeX

    @article{ ISI:000082093000007,
    	author = "Cederquist, H and Fardi, A and Haghighat, K and Langereis, A and Schmidt, HT and Schwartz, SH",
    	title = "{Highly charged ions colliding with atoms, surfaces and clusters}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1999}",
    	volume = "{T80A}",
    	pages = "{46-51}",
    	note = "{IX International Conference on Physics of Highly Charged Ions, BENSHEIM, GERMANY, SEP 09-14, 1998}",
    	abstract = "{in this review we will start out with an effort to describe the present understanding of the dominant mechanisms for electron transfer in collisions between slow highly charged ions and atoms. We then follow up with an account of the most prominent phenomena in highly charged ion-surface collisions and emphasize the similarities and differences between the collision scenarios for atomic and surface targets Finally we will discuss recent advances in the much less mature field of highly charged ion-cluster (mainly C-60) collisions.}",
    	doi = "{10.1238/Physica.Topical.080a00046}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:000082093000007}"
    }
    
  90. H Cederquist, A Fardi, K Haghighat, B Huber, P Hvelplund, A Langereis, MO Larsson, H Lebius, HT Schmidt and SH Schwartz.
    Angular differential cross sections and mean energy gain for single- and multiple-electron capture in slow Ar8+-C-60 collisions. PHYSICA SCRIPTA T80B:203-204, 1999.
    DOI BibTeX

    @article{ ISI:000082093100013,
    	author = "Cederquist, H and Fardi, A and Haghighat, K and Huber, B and Hvelplund, P and Langereis, A and Larsson, MO and Lebius, H and Schmidt, HT and Schwartz, SH",
    	title = "{Angular differential cross sections and mean energy gain for single- and multiple-electron capture in slow Ar8+-C-60 collisions}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1999}",
    	volume = "{T80B}",
    	pages = "{203-204}",
    	note = "{IX International Conference on Physics of Highly Charged Ions, BENSHEIM, GERMANY, SEP 09-14, 1998}",
    	abstract = "{We present experimental results for angular differential cross sections, d sigma/d theta, and mean translational energy gain, Delta E-mean, as functions of the number of electrons, s, stabilized on the projectile in 26.4 keV Ar8++C-60 --> Ar(8-s)++C-60(r+)(r-s)e(-) collisions. The most probable scattering angle increases linearly with s for s=1-7, while processes leading to neutralization (s=8) scatter more strongly than expected from this trend. The Delta E-mean-values are positive and increase with s between s=1 and s=2, are virtually constant up to s=6, and finally decrease to negative values (energy loss) for s=7. The experimental results are compared with Monte Carlo trajectory simulations for impact parameters ranging from small to large values.}",
    	doi = "{10.1238/Physica.Topical.080a00203}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:000082093100013}"
    }
    
  91. L Hagg, A Barany, H Cederquist and U Thumm.
    Angular differential cross sections for slow highly charged ions interacting with C-60. PHYSICA SCRIPTA T80B:205-206, 1999.
    BibTeX

    @article{ ISI:000082093100014,
    	author = "Hagg, L and Barany, A and Cederquist, H and Thumm, U",
    	title = "{Angular differential cross sections for slow highly charged ions interacting with C-60}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1999}",
    	volume = "{T80B}",
    	pages = "{205-206}",
    	note = "{IX International Conference on Physics of Highly Charged Ions, BENSHEIM, GERMANY, SEP 09-14, 1998}",
    	abstract = "{Angular differential cross sections are presented for collisions between 26.4 keV Ar8+ ions and C-60 molecules. Using a classical overbarrier simulation the deflection function is calculated for large impact parameters. To compare with experimental data the theoretical cross section values are convoluted with an instrumental function. Both the theoretical and experimental cross sections are absolute in magnitude and position. The experimental cross section for retaining one electron on the projectile is qualitatively well described by the theoretical cross sections for initially capturing one to four electrons from the target.}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:000082093100014}"
    }
    
  92. HT Schmidt, A Fardi, K Haghighat, A Langereis, JC Levin, L Liljeby, IA Sellin, SH Schwartz and H Cederquist.
    Radiative and nonradiative collisional deexcitation of metastable hydrogen-like ions. PHYSICA SCRIPTA T80B:403-404, 1999.
    DOI BibTeX

    @article{ ISI:000082093100095,
    	author = "Schmidt, HT and Fardi, A and Haghighat, K and Langereis, A and Levin, JC and Liljeby, L and Sellin, IA and Schwartz, SH and Cederquist, H",
    	title = "{Radiative and nonradiative collisional deexcitation of metastable hydrogen-like ions}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1999}",
    	volume = "{T80B}",
    	pages = "{403-404}",
    	note = "{IX International Conference on Physics of Highly Charged Ions, BENSHEIM, GERMANY, SEP 09-14, 1998}",
    	abstract = "{A method is presented to measure separate cross sections for collisional deexcitation of metastable ions via radiative and non-radiative processes. The principle of the experiment is to first determine the total collisional deexcitation cross section in an attenuation-like measurement. After this the non-radiative part is determined separately in a measurement where the ionized target atom (unique to the non-radiative process) is detected. Here we discuss recently published results on deexcitation of metastable He+(2s) ions colliding with Ar at 1.65 keV/amu {[}H. T. Schmidt et al., Phys. Rev A 57, R4082 (1998) and Phys. Rev. A 58 (1998)] as well as preliminary results for a Xe target. In both cases we find that the dominating contribution from radiative deexcitation agrees with the result of a semi-classical calculation of the 2s-2p mixing driven by the induced dipole held of the target atom modified by taking competing processes, for which we measured the cross sections, into account. Finally the extension to H-like projectile ions in higher charge states is discussed.}",
    	doi = "{10.1238/Physica.Topical.080a00403}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:000082093100095}"
    }
    
  93. HT Schmidt, SH Schwartz, J Weimar, R Schuch, H Cederquist, L Bagge, A Kallberg, J Hilke, KG Rensfelt, V Mergel, M Achler, R Dorner, R Moshammer, H Schmidt-Bocking, H Reich, M Unverzagt, W Schmitt and J Ullrich.
    Status report on the internal gas-jet target for the heavy-ion storage ring CRYRING. PHYSICA SCRIPTA T80B:527-528, 1999.
    DOI BibTeX

    @article{ ISI:000082093100145,
    	author = "Schmidt, HT and Schwartz, SH and Weimar, J and Schuch, R and Cederquist, H and Bagge, L and Kallberg, A and Hilke, J and Rensfelt, KG and Mergel, V and Achler, M and Dorner, R and Moshammer, R and Schmidt-Bocking, H and Reich, H and Unverzagt, M and Schmitt, W and Ullrich, J",
    	title = "{Status report on the internal gas-jet target for the heavy-ion storage ring CRYRING}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1999}",
    	volume = "{T80B}",
    	pages = "{527-528}",
    	note = "{IX International Conference on Physics of Highly Charged Ions, BENSHEIM, GERMANY, SEP 09-14, 1998}",
    	abstract = "{A supersonic gas-jet target for investigations of the detailed collision dynamics in fast ion-atom collisions by means of recoil-ion-momentum spectroscopy has been constructed for insertion into the heavy-ion storage ring CRYRING, situated at the Manne Siegbahn Laboratory, Stockholm University. The aim is to create a target with a density of 10(12) cm(-3) and a temperature of less than 10 mK (for the case of a He target) without seriously affecting the excellent vacuum conditions of CRYRING. The gas target will become a part of the storage ring, and hence fast beams of protons, highly-charged ions, and molecular ions will be available as projectiles. Here we present test results for parts of the system. These all indicate that the design criteria will be fulfilled.}",
    	doi = "{10.1238/Physica.Topical.080a00527}",
    	issn = "{0281-1847}",
    	researcherid-numbers = "{Doerner, Reinhard/A-5340-2008}",
    	orcid-numbers = "{Doerner, Reinhard/0000-0002-3728-4268}",
    	unique-id = "{ISI:000082093100145}"
    }
    
  94. HT Schmidt, SH Schwartz, A Fardi, K Haghighat, H Cederquist, L Liljeby, A Langereis, JC Levin and IA Sellin.
    Method for determining absolute partial cross sections for radiative and nonradiative deexcitation of metastable hydrogenlike ions. PHYSICAL REVIEW A 58(4):2887-2894, October 1998.
    DOI BibTeX

    @article{ ISI:000076373900041,
    	author = "Schmidt, HT and Schwartz, SH and Fardi, A and Haghighat, K and Cederquist, H and Liljeby, L and Langereis, A and Levin, JC and Sellin, IA",
    	title = "{Method for determining absolute partial cross sections for radiative and nonradiative deexcitation of metastable hydrogenlike ions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1998}",
    	volume = "{58}",
    	number = "{4}",
    	pages = "{2887-2894}",
    	month = "{OCT}",
    	abstract = "{In this work we present a method developed to measure separately the radiative and nonradiative contributions to the cross section for collisional deexcitation of metastable hydrogenlike ions. We present the results of the first experiment applying this method, where deexcitation of metastable He+(2s) ions in collisions with argon atoms is considered. First the total deexcitation cross section for 6.6 keV He-4(+)(2s) ions is measured absolutely in a beam-gas attenuation experiment. Then the absolute cross section for nonradiative deexcitation is measured separately by coincident detection of projectiles keeping their initial charge state 1+ and recoil ions (formed only in nonradiative deexcitation events). Further, we discuss a semiclassical calculation of the radiative deexcitation cross section, in which the influence of competing electron-capture processes is taken into account in a semiempirical fashion. The result is in agreement with the measured radiative deexcitation cross section of (5.4+/- 1.3)x 10(-16) cm(2), which amounts to (70+/- 8)\% Of the total deexcitation cross section. {[}S1050-2947(98)04110-9].}",
    	doi = "{10.1103/PhysRevA.58.2887}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000076373900041}"
    }
    
  95. MO Larsson, P Hvelplund, MC Larsen, H Shen, H Cederquist and HT Schmidt.
    Electron capture and energy loss in similar to 100 keV collisions of atomic and molecular ions on C-60. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY 177(1):51-62, 1998.
    DOI BibTeX

    @article{ ISI:000075467700006,
    	author = "Larsson, MO and Hvelplund, P and Larsen, MC and Shen, H and Cederquist, H and Schmidt, HT",
    	title = "{Electron capture and energy loss in similar to 100 keV collisions of atomic and molecular ions on C-60}",
    	journal = "{INTERNATIONAL JOURNAL OF MASS SPECTROMETRY}",
    	year = "{1998}",
    	volume = "{177}",
    	number = "{1}",
    	pages = "{51-62}",
    	month = "{AUG 3}",
    	abstract = "{We have determined absolute attenuation and electron capture cross sections in similar to 100 keV collisions between atomic ions of moderate charge states (He+, He2+, Ar2+, Ar3+, Ar4+, Xe2+, Xe3+, Xe4+) and C-60 molecules in the gas phase. The measured cross-sections support previous findings of the charge dynamics within C-60 from electron capture experiments with higher ionic charges. For a non-negligible fraction of the capture events we observed substantial ionic energy loss (less than or equal to 2 keV), which is ascribed to collisions where the ion passes through the C-60 molecule. Furthermore, we found that a molecular ion (100 keV CO22+) that captures an electron from C-60 can lose similar amounts of energy without dissociating. It is concluded that the predominant contribution to the ionic energy loss comes from electron excitation and ionization. (Int J Mass Spectrom 177 (1998) 51-62). (C) 1998 Elsevier Science B.V.}",
    	doi = "{10.1016/S1387-3806(98)14029-0}",
    	issn = "{1387-3806}",
    	unique-id = "{ISI:000075467700006}"
    }
    
  96. HT Schmidt, SH Schwartz, H Cederquist, L Liljeby, JC Levin and IA Sellin.
    Absolute rates for radiative and nonradiative collisional deexcitation of metastable He+(2s) ions. PHYSICAL REVIEW A 57(6):R4082-R4085, June 1998.
    DOI BibTeX

    @article{ ISI:000074160600003,
    	author = "Schmidt, HT and Schwartz, SH and Cederquist, H and Liljeby, L and Levin, JC and Sellin, IA",
    	title = "{Absolute rates for radiative and nonradiative collisional deexcitation of metastable He+(2s) ions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1998}",
    	volume = "{57}",
    	number = "{6}",
    	pages = "{R4082-R4085}",
    	month = "{JUN}",
    	abstract = "{A method devised to measure separate absolute rates for deexcitation of metastable hydrogenic atoms and ions via radiative and nonradiative processes is applied in a pilot study of 6.6-keV He+(2s)-Ar -->He+(1s)-... collisions. An absolute total deexcitation cross section sigma(de)(tot)= (7.6 +/- 1.2)X 10(-16) cm(2) was measured by attenuation. The cross section for nonradiative deexcitation was then measured independently. A radiative branching ratio R-BR=(70 +/- 8)\% was determined, without requiring absolute photon detection calibrations. The measured radiative deexcitation cross section agrees with the result of a semiclassical calculation when competing capture and ionization precesses are taken into account.}",
    	doi = "{10.1103/PhysRevA.57.R4082}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:000074160600003}"
    }
    
  97. N Selberg, C Biedermann and H Cederquist.
    Absolute charge-exchange cross sections for the interaction between slow Xeq+ (15<=q<=43) projectiles and neutral He, Ar, and Xe. PHYSICAL REVIEW A 56(6):4623-4632, December 1997.
    DOI BibTeX

    @article{ ISI:A1997YK23300039,
    	author = "Selberg, N and Biedermann, C and Cederquist, H",
    	title = "{Absolute charge-exchange cross sections for the interaction between slow Xeq+ (15<=q<=43) projectiles and neutral He, Ar, and Xe}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1997}",
    	volume = "{56}",
    	number = "{6}",
    	pages = "{4623-4632}",
    	month = "{DEC}",
    	abstract = "{{We report measurements of absolute cross sections for single- and multiple-electron capture in slow collisions (upsilon similar to-0.1-0.2 a.u.). Partial cross sections for simultaneous r-electron removal from the target and p-electron retainment by the projectile sigma(q,q-p)(r) are presented for the systems Xeq+-B",
    	b = "",
    	doi = "{10.1103/PhysRevA.56.4623}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1997YK23300039}"
    }
    
  98. U Thumm, A Barany, H Cederquist, L Hagg and CJ Setterlind.
    Energy gain in collisions of highly charged ions with C-60. PHYSICAL REVIEW A 56(6):4799-4806, December 1997.
    DOI BibTeX

    @article{ ISI:A1997YK23300059,
    	author = "Thumm, U and Barany, A and Cederquist, H and Hagg, L and Setterlind, CJ",
    	title = "{Energy gain in collisions of highly charged ions with C-60}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1997}",
    	volume = "{56}",
    	number = "{6}",
    	pages = "{4799-4806}",
    	month = "{DEC}",
    	abstract = "{We have extended the recently developed dynamical classical over-barrier model for charge transfer in soft ion-cluster collisions in order to simulate the projectile kinetic energy gain of 3.3q-keV Arq+ ions in large-impact-parameter collisions with neutral C-60 targets. Our semiclassical theory allows for the direct calculation of the energy defect Q and of the projectile kinetic-energy gain in two different ways: either as difference of electronic binding energies before and after the collision or by integration of the dynamically varying force between the collision partners along the trajectory. A comparison between the two ways provides an intrinsic test of the model calculations. A comparison with recent experimental data shows good agreement in the main features of the projectile energy gain spectra and facilitates their interpretation in terms of the number of transferred electrons and projectile shells into which electrons are captured. {[}S1050-2947(97)04512-5].}",
    	doi = "{10.1103/PhysRevA.56.4799}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1997YK23300059}"
    }
    
  99. V Mergel, R Dorner, M Achler, K Khayyat, S Lencinas, J Euler, O Jagutzki, S Nuttgens, M Unverzagt, L Spielberger, W Wu, R Ali, J Ullrich, H Cederquist, A Salin, CJ Wood, RE Olson, D Belkic, CL Cocke and H SchmidtBocking.
    Intra-atomic electron-electron scattering in p-He collisions (Thomas process) investigated by cold target recoil ion momentum spectroscopy. PHYSICAL REVIEW LETTERS 79(3):387-390, 1997.
    DOI BibTeX

    @article{ ISI:A1997XL54900014,
    	author = "Mergel, V and Dorner, R and Achler, M and Khayyat, K and Lencinas, S and Euler, J and Jagutzki, O and Nuttgens, S and Unverzagt, M and Spielberger, L and Wu, W and Ali, R and Ullrich, J and Cederquist, H and Salin, A and Wood, CJ and Olson, RE and Belkic, D and Cocke, CL and SchmidtBocking, H",
    	title = "{Intra-atomic electron-electron scattering in p-He collisions (Thomas process) investigated by cold target recoil ion momentum spectroscopy}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{1997}",
    	volume = "{79}",
    	number = "{3}",
    	pages = "{387-390}",
    	month = "{JUL 21}",
    	abstract = "{We have performed a kinematically complete experiment for the transfer ionization reaction 0.15-1.4 MeV p + He --> H-0 + He2+ + e(-) by measuring the three-dimensional momentum vector of the He2+ ion in coincidence with the scattering angle and the plane of the H-0. In the measured fourfold differential cross section we can clearly distinguish between the independent two-step process of capture plus ionization and the correlated e-e Thomas scattering. We find a upsilon p-(74+/-1) scaling for the total cross section of the e-e Thomas process.}",
    	doi = "{10.1103/PhysRevLett.79.387}",
    	issn = "{0031-9007}",
    	researcherid-numbers = "{Doerner, Reinhard/A-5340-2008}",
    	orcid-numbers = "{Doerner, Reinhard/0000-0002-3728-4268}",
    	unique-id = "{ISI:A1997XL54900014}"
    }
    
  100. MO Larsson, A Wannstrom, M Wang, A Arnesen, F Heijkenskjold, A Langereis, B Nystrom, RW McCullough and H Cederquist.
    Photon-emission studies of slow C4+-Ne collisions. PHYSICAL REVIEW A 55(3):1911-1921, March 1997.
    DOI BibTeX

    @article{ ISI:A1997WN17400048,
    	author = "Larsson, MO and Wannstrom, A and Wang, M and Arnesen, A and Heijkenskjold, F and Langereis, A and Nystrom, B and McCullough, RW and Cederquist, H",
    	title = "{Photon-emission studies of slow C4+-Ne collisions}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1997}",
    	volume = "{55}",
    	number = "{3}",
    	pages = "{1911-1921}",
    	month = "{MAR}",
    	abstract = "{We present absolute term- and level-selective cross sections for specific single- and double-electron capture processes in slow (16 keV) C4+-Ne collisions. The results are deduced through a combined analysis of earlier translational energy-gain data and the present photon-emission cross sections in the region 40-240 nm. We find that double-electron capture is dominated by processes in which two electrons appear to change orbitals in a single interaction of two diabatic quasimolecular potential curves-a type of process which rarely has been isolated before. Furthermore, we observe a strong preference for population of 2s2p over 2p(2) configurations in these one-step two-electron capture reactions. This is a remarkable configuration selectivity, since reaction channels leading to 2s2p and 2p(2) configurations cross with the incident channel at almost the same internuclear distances.}",
    	doi = "{10.1103/PhysRevA.55.1911}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1997WN17400048}"
    }
    
  101. HT Schmidt, H Cederquist, R Schuch, L Bagge, A Kallberg, J Hilke, KG Rensfelt, V Mergel, M Achler, R Dorner, L Spielberger, O Jagutzki, H SchmidtBocking, J Ullrich, H Reich, M Unverzagt, W Schmitt and R Moshammer.
    A design study for an internal gas-jet target for the heavy-ion storage ring CRYRING. HYPERFINE INTERACTIONS 108(1-3):339-354, 1997.
    DOI BibTeX

    @article{ ISI:A1997XE44700036,
    	author = "Schmidt, HT and Cederquist, H and Schuch, R and Bagge, L and Kallberg, A and Hilke, J and Rensfelt, KG and Mergel, V and Achler, M and Dorner, R and Spielberger, L and Jagutzki, O and SchmidtBocking, H and Ullrich, J and Reich, H and Unverzagt, M and Schmitt, W and Moshammer, R",
    	title = "{A design study for an internal gas-jet target for the heavy-ion storage ring CRYRING}",
    	journal = "{HYPERFINE INTERACTIONS}",
    	year = "{1997}",
    	volume = "{108}",
    	number = "{1-3}",
    	pages = "{339-354}",
    	note = "{2nd Euroconference on Atomic Physics with Stored Highly Charged Ions, STOCKHOLM, SWEDEN, JUN 03-07, 1996}",
    	organization = "{Royal Swedish Acad Sci}",
    	abstract = "{This paper presents the design of the internal gas-jet target, CRYJET, which is being constructed for investigations of, e.g., fast ion-atom collisions in the heavy-ion storage and cooler ring CRYRING at the Manne Siegbahn Laboratory, Stockholm University. The goal for the design work was to create an ultra-cold He target (less than or equal to 10 mK in the longitudinal direction and 0.5 mK transverse temperature) with a density of similar to 10(12) atoms/cm(3). Care was taken in order to minimize the influence from the jet on the very low background pressure in the storage ring (similar to 10(-11) mbar) The low temperature is essential for the resolution in the experiments. The high density will enable us to get sufficient luminosities for investigations of processes with cross sections down to the 10(-27) cm(2) range. The gas-jet target will be equipped with two recoil-ion-momentum spectrometers in order to extract detailed information about the collision dynamics.}",
    	doi = "{10.1023/A:1012635418262}",
    	issn = "{0304-3843}",
    	researcherid-numbers = "{Doerner, Reinhard/A-5340-2008}",
    	orcid-numbers = "{Doerner, Reinhard/0000-0002-3728-4268}",
    	unique-id = "{ISI:A1997XE44700036}"
    }
    
  102. N Selberg, C Biedermann and H Cederquist.
    Semiempirical scaling laws for electron capture at low energies. PHYSICAL REVIEW A 54(5):4127-4135, November 1996.
    DOI BibTeX

    @article{ ISI:A1996VT67300055,
    	author = "Selberg, N and Biedermann, C and Cederquist, H",
    	title = "{Semiempirical scaling laws for electron capture at low energies}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1996}",
    	volume = "{54}",
    	number = "{5}",
    	pages = "{4127-4135}",
    	month = "{NOV}",
    	abstract = "{We present semiempirical scaling laws for different electronic rearrangement features in slow collisions with ions of high charge q. The absolute cross section for removing exactly r electrons from the target is found to be well described by the scaling (sc) relation (sc)sigma(q)(r)=(2.7X10(-13))qr/{[}(IlIr2)-I-2 Sigma(j=1)(j=N) (j/I-2(j))] cm(2), where I-j is the jth target ionization potential in eV, and N is the number of outer-shell electrons. This expression and the related total recoil-ion charge-state fractions (sc)f(q)(r)=(sc)sigma(q)(r)/Sigma(r) (sc)sigma(q)(r), compare favorably with recent experimental results ((ex)sigma(q,q-p)(r)) for slow Xe-q+ ions (15 less than or equal to q less than or equal to 43) colliding with He, Ar, and Xe. We discuss the possibility of establishing scaling laws for phenomenological cross sections sigma(q,q-p), where only the number of electrons retained by the projectile p is specified.}",
    	doi = "{10.1103/PhysRevA.54.4127}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1996VT67300055}"
    }
    
  103. N Selberg, A Barany, C Biedermann, CJ Setterlind, H Cederquist, A Langereis, MO Larsson, A Wannstrom and P Hvelplund.
    Slow collisions between highly charged ions and C-60: Absolute Delta E values and cross sections. PHYSICAL REVIEW A 53(2):874-879, February 1996.
    DOI BibTeX

    @article{ ISI:A1996TV64800030,
    	author = "Selberg, N and Barany, A and Biedermann, C and Setterlind, CJ and Cederquist, H and Langereis, A and Larsson, MO and Wannstrom, A and Hvelplund, P",
    	title = "{Slow collisions between highly charged ions and C-60: Absolute Delta E values and cross sections}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1996}",
    	volume = "{53}",
    	number = "{2}",
    	pages = "{874-879}",
    	month = "{FEB}",
    	abstract = "{We present energy-gain distributions for net one- and two-electron transfer in slow Ar-q+-C-60 collisions. The Delta E-spectra for the former peak at Delta E(1) = 12.9 +/- 0.4 (nl = 7s and 7p), 15.5 +/- 1.0 (n = 10), 15.1 +/- 0.5 (n = 11), and 13.8 +/- 0.4 eV (n = 12) for q = 8, 13, 14, and 15, respectively. The total reaction cross sections are sigma(tot) = 4.6 +/- 1.4 (q = 8), 10.1 +/- 2.8 (q = 13), 7.1 +/- 2.0 (q = 14), and 10.0 +/- 3.1 (q = 15) in units of 10(-14) cm(2). These results are discussed within a simple qualitative model in which the transient localization of the positive charge on the C-60(+) ion just after transfer of one electron is a free parameter.}",
    	doi = "{10.1103/PhysRevA.53.874}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1996TV64800030}"
    }
    
  104. H SHEN, P HVELPLUND, D MATHUR, A BARANY, H CEDERQUIST, N SELBERG and DC LORENTS.
    FULLERENE-FULLERENE COLLISIONS - FRAGMENTATION AND ELECTRON-CAPTURE. PHYSICAL REVIEW A 52(5):3847-3851, November 1995.
    DOI BibTeX

    @article{ ISI:A1995TE17300067,
    	author = "SHEN, H and HVELPLUND, P and MATHUR, D and BARANY, A and CEDERQUIST, H and SELBERG, N and LORENTS, DC",
    	title = "{FULLERENE-FULLERENE COLLISIONS - FRAGMENTATION AND ELECTRON-CAPTURE}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1995}",
    	volume = "{52}",
    	number = "{5}",
    	pages = "{3847-3851}",
    	month = "{NOV}",
    	abstract = "{In this paper, we describe collisions between high-energy (100-keV) fullerene ions (C-60(+), C-60(2+), C-70(2+), and C-70(3+)) and C-60. The fast, forward-directed charged collision products are identified leading to information on electron capture and loss as well as fragmentation. Similar studies are performed on rare-gas targets (He and Xe), and the fragmentation patterns and charge-exchange cross sections are compared and discussed. The electron-capture cross sections are two orders of magnitude larger for collisions with C-60 as compared to Xe, while the smaller cluster-ion fragment peaks are only 3-6 times more intense. These observations are discussed in the light of the low ionization energy and the large mass and size of C-60.}",
    	doi = "{10.1103/PhysRevA.52.3847}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1995TE17300067}"
    }
    
  105. H CEDERQUIST, C BIEDERMANN, N SELBERG and P HVELPLUND.
    MEASUREMENTS OF TRANSLATIONAL ENERGY GAIN FOR ONE-ELECTRON AND 2-ELECTRON TRANSFER IN SLOW AR-Q+-HE (Q=15-18) COLLISIONS. PHYSICAL REVIEW A 51(3):2169-2178, March 1995.
    DOI BibTeX

    @article{ ISI:A1995QN23100061,
    	author = "CEDERQUIST, H and BIEDERMANN, C and SELBERG, N and HVELPLUND, P",
    	title = "{MEASUREMENTS OF TRANSLATIONAL ENERGY GAIN FOR ONE-ELECTRON AND 2-ELECTRON TRANSFER IN SLOW AR-Q+-HE (Q=15-18) COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1995}",
    	volume = "{51}",
    	number = "{3}",
    	pages = "{2169-2178}",
    	month = "{MAR}",
    	doi = "{10.1103/PhysRevA.51.2169}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1995QN23100061}"
    }
    
  106. H CEDERQUIST, C BIEDERMANN, N SELBERG and P HVELPLUND.
    OSCILLATIONS IN MEAN CAPTURE Q-VALUES AS FUNCTIONS OF THE PROJECTILE CHARGE IN SLOW XE-Q+-HE (25-LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-44) COLLISIONS. PHYSICAL REVIEW A 51(3):2191-2198, March 1995.
    DOI BibTeX

    @article{ ISI:A1995QN23100064,
    	author = "CEDERQUIST, H and BIEDERMANN, C and SELBERG, N and HVELPLUND, P",
    	title = "{OSCILLATIONS IN MEAN CAPTURE Q-VALUES AS FUNCTIONS OF THE PROJECTILE CHARGE IN SLOW XE-Q+-HE (25-LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-44) COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1995}",
    	volume = "{51}",
    	number = "{3}",
    	pages = "{2191-2198}",
    	month = "{MAR}",
    	doi = "{10.1103/PhysRevA.51.2191}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1995QN23100064}"
    }
    
  107. N KELLER, RD MILLER, M WESTERLIND, SB ELSTON, IA SELLIN, LR ANDERSSON, C BIEDERMANN and H CEDERQUIST.
    ANGULAR-DISTRIBUTIONS FOR SINGLE-ELECTRON AND DOUBLE-ELECTRON CAPTURE IN SLOW C(4+)-NE COLLISIONS. PHYSICAL REVIEW A 50(1):462-467, July 1994.
    DOI BibTeX

    @article{ ISI:A1994NX00100058,
    	author = "KELLER, N and MILLER, RD and WESTERLIND, M and ELSTON, SB and SELLIN, IA and ANDERSSON, LR and BIEDERMANN, C and CEDERQUIST, H",
    	title = "{ANGULAR-DISTRIBUTIONS FOR SINGLE-ELECTRON AND DOUBLE-ELECTRON CAPTURE IN SLOW C(4+)-NE COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1994}",
    	volume = "{50}",
    	number = "{1}",
    	pages = "{462-467}",
    	month = "{JUL}",
    	abstract = "{In an earlier experiment by H. Cederquist et al. {[}J. Phys. B 18, 3951 (1985)] an unusual Q-value distribution for true double-electron capture was reported for 400-eV C4+-Ne collisions: strong population of reaction channels resulting in Q values between 27 and 35 eV followed by weakly populated channels in the region 18-25 eV and then again a strong channel at Q=16 eV. The last channel is nearly degenerate in Q value with the dominant single-electron capture reaction. Here, we report measured angular distributions for scattered projectiles in single- and double-electron capture at collision energies 0.6-1.0 keV. At 0.6 keV both single- and double-electron capture exhibit strong forward peaks for Q approximately 16 eV. The intensity for the latter, but not the former, decreases drastically when the energy is raised to 1 keV. The energy dependence of the angular distribution for double-electron capture with Q > 20 eV can be qualitatively understood in simple terms; single-electron captures to 2s and 2p orbitals, however, yield unexpectedly wide and structured angular distributions.}",
    	doi = "{10.1103/PhysRevA.50.462}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1994NX00100058}"
    }
    
  108. JC LEVIN, RT SHORT, C BIEDERMANN, H CEDERQUIST, SB ELSTON, CS O and IA SELLIN.
    DETERMINATION OF MEAN ENERGIES AND IMPACT PARAMETERS CHARACTERISTIC OF CHARGE-CHANGING REACTIONS. PHYSICAL REVIEW A 49(1):228-235, January 1994.
    DOI BibTeX

    @article{ ISI:A1994MT25800030,
    	author = "LEVIN, JC and SHORT, RT and BIEDERMANN, C and CEDERQUIST, H and ELSTON, SB and O, CS and SELLIN, IA",
    	title = "{DETERMINATION OF MEAN ENERGIES AND IMPACT PARAMETERS CHARACTERISTIC OF CHARGE-CHANGING REACTIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1994}",
    	volume = "{49}",
    	number = "{1}",
    	pages = "{228-235}",
    	month = "{JAN}",
    	abstract = "{Measurements are reported of mean energies of argon recoil ions produced by beams of 23-MeV Cl-5+,Cl-8+,Cl-10+ or 19-MeV F9+, and of neon recoil ions produced by beams of 22-MeV Cl4+, detected in coincidence with the charge-changed outgoing projectile. A screened-elastic-Coulomb-scattering calculation permits estimation of impact parameters characteristic of each pair (q, r) of final projectile- (q) and recoil- (r) ion charge states. The results are found to be in good agreement with impact parameters deduced from measured cross sections and do not require measurement of projectile scattering angle.}",
    	doi = "{10.1103/PhysRevA.49.228}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1994MT25800030}"
    }
    
  109. N KELLER, LR ANDERSSON, RD MILLER, M WESTERLIND, SB ELSTON, IA SELLIN, C BIEDERMANN and H CEDERQUIST.
    ANGULAR-DISTRIBUTIONS FOR DOUBLE-ELECTRON CAPTURE IN C4+-HE COLLISIONS. PHYSICAL REVIEW A 48(5):3684-3688, November 1993.
    DOI BibTeX

    @article{ ISI:A1993MF74300042,
    	author = "KELLER, N and ANDERSSON, LR and MILLER, RD and WESTERLIND, M and ELSTON, SB and SELLIN, IA and BIEDERMANN, C and CEDERQUIST, H",
    	title = "{ANGULAR-DISTRIBUTIONS FOR DOUBLE-ELECTRON CAPTURE IN C4+-HE COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1993}",
    	volume = "{48}",
    	number = "{5}",
    	pages = "{3684-3688}",
    	month = "{NOV}",
    	abstract = "{We have studied the angular distributions of double-electron capture in C4+ + He collisions in the 400-800-eV collision energy range. At all measured energies an interference pattern has been observed which is attributed to Stueckelberg oscillations. A comparison with calculated differential cross sections using a two-state diabatic potential matrix of Danared and Barany {[}J. Phys. B 19, 3109 (1986)] shows a reasonable agreement at 800 eV, while at lower energies the calculations show a shift of the peak positions towards larger angles. An alternative model by Barat et al. {[}J. Phys. B 23, 2811 (1990)], developed for collisions in the keV range, was also employed and was found to agree less well with our data, succinctly illustrating the increasing sensitivity to the `'exact'' potential shape with decreasing collision energy.}",
    	doi = "{10.1103/PhysRevA.48.3684}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1993MF74300042}"
    }
    
  110. T QUINTEROS, R SCHUCH, M PAJEK, P SIGRAY, H CEDERQUIST, H DANARED, L BAGGE, A FILEVICH, J JEANSSON, A KALLBERG and A PAAL.
    A NOVEL BEAM-PROFILE MONITOR FOR STORAGE-RINGS. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 333(2-3):288-293, 1993.
    DOI BibTeX

    @article{ ISI:A1993LR94900009,
    	author = "QUINTEROS, T and SCHUCH, R and PAJEK, M and SIGRAY, P and CEDERQUIST, H and DANARED, H and BAGGE, L and FILEVICH, A and JEANSSON, J and KALLBERG, A and PAAL, A",
    	title = "{A NOVEL BEAM-PROFILE MONITOR FOR STORAGE-RINGS}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT}",
    	year = "{1993}",
    	volume = "{333}",
    	number = "{2-3}",
    	pages = "{288-293}",
    	month = "{SEP 1}",
    	abstract = "{We have developed a novel, nondestructive, beam-profile monitor for ion storage rings. The horizontal profile of the stored ion beam is determined by detecting electrons from the ionization of the residual gas with a two-dimensional position sensitive detector. The strong magnetic field, provided by one of the bending magnets, conserves the information on the initial horizontal positions of ionized electrons during their transport to the detector by means of a vertical electric field. The monitor is tested at the storage ring CRYRING in Stockholm for a 6 MeV/amu D+ beam. We show that in this case, where the lifetime of the stored beam is restricted by single scattering on the residual gas, a reduction of the lifetime occurs due to the reduced angular acceptance.}",
    	doi = "{10.1016/0168-9002(93)91168-M}",
    	issn = "{0168-9002}",
    	unique-id = "{ISI:A1993LR94900009}"
    }
    
  111. N KELLER, RD MILLER, M WESTERLIND, LR ANDERSSON, SB ELSTON, IA SELLIN, C BIEDERMANN and H CEDERQUIST.
    ANGULAR-DISTRIBUTIONS OF CHARGE-EXCHANGE COLLISIONS AT VERY-LOW ENERGIES. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 79(1-4):52-54, June 1993.
    DOI BibTeX

    @article{ ISI:A1993LH98400017,
    	author = "KELLER, N and MILLER, RD and WESTERLIND, M and ANDERSSON, LR and ELSTON, SB and SELLIN, IA and BIEDERMANN, C and CEDERQUIST, H",
    	title = "{ANGULAR-DISTRIBUTIONS OF CHARGE-EXCHANGE COLLISIONS AT VERY-LOW ENERGIES}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1993}",
    	volume = "{79}",
    	number = "{1-4}",
    	pages = "{52-54}",
    	month = "{JUN}",
    	note = "{12TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY, UNIV N TEXAS, DENTON, TX, NOV 02-05, 1992}",
    	organization = "{US DOE; NATL SCI FDN; OAK RIDGE ASSOC UNIV; UNIV N TEXAS}",
    	abstract = "{We have measured angular distributions of double-electron capture in C4+-->He collisions at energies between 400 and 800 eV. The experimental energy-gain spectra show that the ground state of C2+ (1S2 2S2) is populated. In the angular distributions we observe an interference pattern which is attributed to Stueckelberg oscillations. The presented results are compared to experimental data as well as to theoretical calculations by other authors.}",
    	doi = "{10.1016/0168-583X(93)95283-B}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1993LH98400017}"
    }
    
  112. H CEDERQUIST, C BIEDERMANN, N SELBERG, E BEEBE, M PAJEK and A BARANY.
    STRONG ONSET OF IONIZATION IN SLOW XE-Q+-XE COLLISIONS AT VERY HIGH Q. PHYSICAL REVIEW A 47(6):R4551-R4554, June 1993.
    BibTeX

    @article{ ISI:A1993LF72700001,
    	author = "CEDERQUIST, H and BIEDERMANN, C and SELBERG, N and BEEBE, E and PAJEK, M and BARANY, A",
    	title = "{STRONG ONSET OF IONIZATION IN SLOW XE-Q+-XE COLLISIONS AT VERY HIGH Q}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1993}",
    	volume = "{47}",
    	number = "{6}",
    	pages = "{R4551-R4554}",
    	month = "{JUN}",
    	abstract = "{We have discovered that ionization without accompanying electron capture is an important process in slow (v is similar to 0.1-0.2 a.u.) Xe(q+)-Xe collisions at very high projectile charge (q >25). The measured absolute cross sections, although between one and two orders of magnitude lower than the ones for single-electron capture, increase rapidly with q when q >25 and reach a level of approximately 1 x 10(-15) cm2 for q >30. We argue that the reaction mechanism for ionization of the heavier rare gases involves the formation of core-excited, autoionizing, neutral target states.}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1993LF72700001}"
    }
    
  113. H CEDERQUIST, C BIEDERMANN, N SELBERG, L LILJEBY and E BEEBE.
    STRONG RADIATIVE DECAY OF DOUBLE RYDBERG STATES IN HIGH-Q IONS. PHYSICA SCRIPTA T46:218-224, 1993.
    DOI BibTeX

    @article{ ISI:A1993LM44400034,
    	author = "CEDERQUIST, H and BIEDERMANN, C and SELBERG, N and LILJEBY, L and BEEBE, E",
    	title = "{STRONG RADIATIVE DECAY OF DOUBLE RYDBERG STATES IN HIGH-Q IONS}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1993}",
    	volume = "{T46}",
    	pages = "{218-224}",
    	note = "{NOBEL SYMP 85 : HEAVY-ION SPECTROSCOPY AND QUANTUM-ELECTRODYNAMIC EFFECTS IN ATOMIC SYSTEMS, SALTSJOBADEN, SWEDEN, JUN 29-JUL 03, 1992}",
    	abstract = "{We have measured cross sections for true double-electron capture (DC) and transfer ionization (TI) in slow Xe(q+)-(Ar, He, Xe) collisions in the charge-state regime 15 less-than-or-equal-to q less-than-or-equal-to 44. Following the extended classical over-the-barrier model we assume that the first step in the population mechanism is the same for both processes and that the two transferred electrons initially go to a double Rydberg state. We define total probabilities for radiative stabilization as P(rad) = sigma(DC)/(sigma(DC) + sigma(TI)). These quantities represent products of the branching ratios for radiative decay of all the individual intermediate states in the decay processes averaged over the possible cascade paths. Within the experimental uncertainties there is no difference for P(rad) measured for two-electron transfer from He, Ar, or Xe. The common q-behaviour of P(rad) consists of a strong increase in the region 26 < q < 36 to a level of about 0.35, a `'flat top'' for 37 < q < 42, and a rather steep decrease for q = 43 and 44. Apparently, a substantial fraction of the intermediate states have high branching ratios for radiative decay. Electron emission seems to occur late in the cascade when one of the electrons is close to the core. We offer a qualitative explanation for these observations and discuss the possible influence from configuration mixing with strongly asymmetric doubly excited states at high q.}",
    	doi = "{10.1088/0031-8949/1993/T46/033}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1993LM44400034}"
    }
    
  114. H CEDERQUIST, H ANDERSSON, E BEEBE, C BIEDERMANN, L BROSTROM, A ENGSTROM, H GAO, R HUTTON, JC LEVIN, L LILJEBY, M PAJEK, T QUINTEROS, N SELBERG and P SIGRAY.
    INCREASE OF TRUE DOUBLE-ELECTRON-CAPTURE CROSS-SECTIONS IN SLOW XE-Q+ -(XE,HE) COLLISIONS AT VERY HIGH-Q. PHYSICAL REVIEW A 46(5):2592-2595, 1992.
    DOI BibTeX

    @article{ ISI:A1992JM06300050,
    	author = "CEDERQUIST, H and ANDERSSON, H and BEEBE, E and BIEDERMANN, C and BROSTROM, L and ENGSTROM, A and GAO, H and HUTTON, R and LEVIN, JC and LILJEBY, L and PAJEK, M and QUINTEROS, T and SELBERG, N and SIGRAY, P",
    	title = "{INCREASE OF TRUE DOUBLE-ELECTRON-CAPTURE CROSS-SECTIONS IN SLOW XE-Q+ -(XE,HE) COLLISIONS AT VERY HIGH-Q}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1992}",
    	volume = "{46}",
    	number = "{5}",
    	pages = "{2592-2595}",
    	month = "{SEP 1}",
    	abstract = "{We have measured cross sections for true double-electron capture (DC) and transfer ionization (TI) in slow Xe(q+)-(Xe,He) collisions in the charge-state regime 15 less-than-or-equal-to q less-than-or-equal-to 42. We find that the probabilities for radiative stabilization P(rad)=sigma(DC)/(sigma(DC)+sigma(TI)) increase rapidly with q for q greater-than-or-equal-to 28 and are very similar for two-electron transfer from Xe and He. This surprising similarity indicates that the core structure of the projectile, rather than the initially populated capture state, is decisive for the electronic relaxation process.}",
    	doi = "{10.1103/PhysRevA.46.2592}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1992JM06300050}"
    }
    
  115. H CEDERQUIST, E BEEBE, C BIEDERMANN, A ENGSTROM, H GAO, R HUTTON, JC LEVIN, L LILJEBY, T QUINTEROS, N SELBERG and P SIGRAY.
    ON THE ROLE OF TRANSFER EXCITATION IN SLOW XEQ+-HE,XE (15-LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-42) COLLISIONS. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 25(3):L69-L75, 1992.
    DOI BibTeX

    @article{ ISI:A1992HE52600004,
    	author = "CEDERQUIST, H and BEEBE, E and BIEDERMANN, C and ENGSTROM, A and GAO, H and HUTTON, R and LEVIN, JC and LILJEBY, L and QUINTEROS, T and SELBERG, N and SIGRAY, P",
    	title = "{ON THE ROLE OF TRANSFER EXCITATION IN SLOW XEQ+-HE,XE (15-LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-42) COLLISIONS}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1992}",
    	volume = "{25}",
    	number = "{3}",
    	pages = "{L69-L75}",
    	month = "{FEB 14}",
    	abstract = "{We have measured cross sections for single-electron capture, true double-electron capture and transfer ionization in slow (0.1-0.2 au) collisions of Xe(q)+ (15 less-than-or-equal-to q less-than-or-equal-to 42) with He and Xe targets. The ratio of two- to one-electron removal from Xe is about twice that from He for high q. This difference is accounted for quantitatively by assuming an independent-electron transfer-excitation mechanism, which turns out to be effective for two- but not for multiple-electron targets.}",
    	doi = "{10.1088/0953-4075/25/3/004}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1992HE52600004}"
    }
    
  116. LR ANDERSSON, H CEDERQUIST, A BARANY, L LILJEBY, C BIEDERMANN, JC LEVIN, N KELLER, SB ELSTON, JP GIBBONS and IA SELLIN.
    ONE-STEP AND 2-STEP DOUBLE-ELECTRON CAPTURE IN SLOW AR-6+-HE COLLISIONS. PHYSICAL REVIEW A 45(1):R4-R7, 1992.
    DOI BibTeX

    @article{ ISI:A1992GY51800002,
    	author = "ANDERSSON, LR and CEDERQUIST, H and BARANY, A and LILJEBY, L and BIEDERMANN, C and LEVIN, JC and KELLER, N and ELSTON, SB and GIBBONS, JP and SELLIN, IA",
    	title = "{ONE-STEP AND 2-STEP DOUBLE-ELECTRON CAPTURE IN SLOW AR-6+-HE COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1992}",
    	volume = "{45}",
    	number = "{1}",
    	pages = "{R4-R7}",
    	month = "{JAN 1}",
    	abstract = "{Double-electron capture by slow (15-30 eV/u) Ar6+ ions from He has been studied by simultaneous measurements of postcollisional projectile energy-gain and angular distributions. The recorded spectra are interpreted with the aid of a semiclassical collision model. We find evidence for distinguishable one- and two-step double-electron capture in the energy region investigated.}",
    	doi = "{10.1103/PhysRevA.45.R4}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1992GY51800002}"
    }
    
  117. C BIEDERMANN, JC LEVIN, RT SHORT, SB ELSTON, JP GIBBONS, K KIMURA, N KELLER, IA SELLIN, H CEDERQUIST, LR ANDERSSON, H ANDERSSON and L LILJEBY.
    ANGULAR-DISTRIBUTIONS OF SINGLE-ELECTRON AND DOUBLE-ELECTRON CAPTURE IN VERY-SLOW AR6+-AR COLLISIONS. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 56-7(Part 1):74-77, May 1991.
    DOI BibTeX

    @article{ ISI:A1991FQ88800024,
    	author = "BIEDERMANN, C and LEVIN, JC and SHORT, RT and ELSTON, SB and GIBBONS, JP and KIMURA, K and KELLER, N and SELLIN, IA and CEDERQUIST, H and ANDERSSON, LR and ANDERSSON, H and LILJEBY, L",
    	title = "{ANGULAR-DISTRIBUTIONS OF SINGLE-ELECTRON AND DOUBLE-ELECTRON CAPTURE IN VERY-SLOW AR6+-AR COLLISIONS}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1991}",
    	volume = "{56-7}",
    	number = "{Part 1}",
    	pages = "{74-77}",
    	month = "{MAY}",
    	note = "{11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY, DENTON, TX, NOV 05-08, 1990}",
    	abstract = "{We have measured state-resolved angular distributions of one- and two- electron capture in 32 to 800 eV Ar6+-Ar collisions. The experimental energy-gain spectra show that single-electron capture mainly populates the 5s, 5p and 4f levels. We observe detailed structures in the corresponding angular distributions, but a final interpretation has to await a quantitative analysis of the collision dynamics. We tentatively ascribe the main features in the angular distribution of true double-electron capture at Q approximately 26 eV (4s4f and 4s5s) and Q approximately 42 eV (3d4d) to processes involving two consecutive one-electron transitions. For the transfer ionization process, we measure a Q-value of approximately 26 eV, which we assign to autoionizing 4s5s (or 4s4f) levels. The 4s5s, 4s4f, and 3d4d levels all reside above the first ionization limit of Ar4+, but we find that the 3d4d level stabilizes through radiative decay.}",
    	doi = "{10.1016/0168-583X(91)95975-J}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1991FQ88800024}"
    }
    
  118. LR ANDERSSON, A BARANY, H CEDERQUIST and C BIEDERMANN.
    ANGULAR SCATTERING IN LOW-ENERGY COLLISIONS INVOLVING MULTICHARGED IONS. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 56-7(Part 1):246-249, May 1991.
    DOI BibTeX

    @article{ ISI:A1991FQ88800065,
    	author = "ANDERSSON, LR and BARANY, A and CEDERQUIST, H and BIEDERMANN, C",
    	title = "{ANGULAR SCATTERING IN LOW-ENERGY COLLISIONS INVOLVING MULTICHARGED IONS}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1991}",
    	volume = "{56-7}",
    	number = "{Part 1}",
    	pages = "{246-249}",
    	month = "{MAY}",
    	note = "{11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY, DENTON, TX, NOV 05-08, 1990}",
    	abstract = "{Calculations of angular differential cross sections in charge exchange collisions between Ar6+ and He in the 1.6-25 eV/u energy range have been performed. Results from a fully quantal model potential method and from a classical trajectory multichannel Landau-Zener (MCLZ) method are compared. Allowing for singly excited states on Ar5+, and after convolution with a typical experimental resolution, the two methods are in fair agreement. Recent experimental results do not, however, support the theoretical findings at the lowest energies. We propose that population of final states of the type 3s3p3d on Ar5+, which were not included in the original calculations, are the reason for this discrepancy. A MCLZ calculation including these channels gives support to this hypothesis.}",
    	doi = "{10.1016/0168-583X(91)96016-E}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1991FQ88800065}"
    }
    
  119. LR ANDERSSON, H CEDERQUIST, A BARANY, L LILJEBY, C BIEDERMANN, JC LEVIN, N KELLER, SB ELSTON, JP GIBBONS, K KIMURA and IA SELLIN.
    SIMULTANEOUS SINGLE-ELECTRON CAPTURE AND PROJECTILE-CORE EXCITATION ENHANCED THROUGH CONFIGURATION-INTERACTION IN VERY SLOW AR6+-HE COLLISIONS. PHYSICAL REVIEW A 43(7):4075-4078, 1991.
    DOI BibTeX

    @article{ ISI:A1991FG21600104,
    	author = "ANDERSSON, LR and CEDERQUIST, H and BARANY, A and LILJEBY, L and BIEDERMANN, C and LEVIN, JC and KELLER, N and ELSTON, SB and GIBBONS, JP and KIMURA, K and SELLIN, IA",
    	title = "{SIMULTANEOUS SINGLE-ELECTRON CAPTURE AND PROJECTILE-CORE EXCITATION ENHANCED THROUGH CONFIGURATION-INTERACTION IN VERY SLOW AR6+-HE COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1991}",
    	volume = "{43}",
    	number = "{7}",
    	pages = "{4075-4078}",
    	month = "{APR 1}",
    	abstract = "{We report experimental angular differential cross sections for one-electron capture in Ar6+ - He collisions at very low energies (1.6 - 13 eV/u). The cross sections show an unexpectedly high population of core-excited states of Ar5+. An alternative mechanism for enhanced capture excitation through configuration interaction is proposed.}",
    	doi = "{10.1103/PhysRevA.43.4075}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1991FG21600104}"
    }
    
  120. H CEDERQUIST.
    TRANSFER EXCITATION IN SLOW COLLISIONS BETWEEN IONS OF VERY HIGH CHARGE AND 2-ELECTRON TARGETS. PHYSICAL REVIEW A 43(5):2306-2310, 1991.
    DOI BibTeX

    @article{ ISI:A1991EZ70200021,
    	author = "CEDERQUIST, H",
    	title = "{TRANSFER EXCITATION IN SLOW COLLISIONS BETWEEN IONS OF VERY HIGH CHARGE AND 2-ELECTRON TARGETS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1991}",
    	volume = "{43}",
    	number = "{5}",
    	pages = "{2306-2310}",
    	month = "{MAR 1}",
    	abstract = "{We argue that a three-step transfer-excitation (capture and target excitation) mechanism enhances (depletes) the cross section for one- (two-) electron removal from a two-electron target. This mechanism, which becomes very important at high projectile charge (q), is mediated through quasimolecular couplings between diabatic double-capture and transfer-excitation channels, in which the inner of two active electrons is transferred to an excited target state. The inclusion of this process in the extended classical over-barrier model gives excellent agreement with unexplained experimental cross sections for one- and two-electron removal from He is slow collisions with Xe ions of high charge (q less-than-or-equal-to 31).}",
    	doi = "{10.1103/PhysRevA.43.2306}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1991EZ70200021}"
    }
    
  121. W FRITSCH, HB GILBODY, RE OLSON, H CEDERQUIST, RK JANEV, K KATSONIS and G YUDIN.
    REVIEW OF THE DATA-BASE FOR COLLISIONS OF H, H-2 AND HE WITH METALLIC IMPURITY IONS. PHYSICA SCRIPTA T37:11-13, 1991.
    DOI BibTeX

    @article{ ISI:A1991FW88200004,
    	author = "FRITSCH, W and GILBODY, HB and OLSON, RE and CEDERQUIST, H and JANEV, RK and KATSONIS, K and YUDIN, G",
    	title = "{REVIEW OF THE DATA-BASE FOR COLLISIONS OF H, H-2 AND HE WITH METALLIC IMPURITY IONS}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1991}",
    	volume = "{T37}",
    	pages = "{11-13}",
    	doi = "{10.1088/0031-8949/1991/T37/003}",
    	issn = "{0281-1847}",
    	researcherid-numbers = "{Fritsch, Wolfgang/B-3412-2009}",
    	unique-id = "{ISI:A1991FW88200004}"
    }
    
  122. H CEDERQUIST and A BARANY.
    ABSOLUTE EXPERIMENTAL AND MODEL CROSS-SECTIONS FOR SLOW IONS OF VERY HIGH CHARGE COLLIDING WITH HE. PHYSICA SCRIPTA T37:94-100, 1991.
    DOI BibTeX

    @article{ ISI:A1991FW88200017,
    	author = "CEDERQUIST, H and BARANY, A",
    	title = "{ABSOLUTE EXPERIMENTAL AND MODEL CROSS-SECTIONS FOR SLOW IONS OF VERY HIGH CHARGE COLLIDING WITH HE}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1991}",
    	volume = "{T37}",
    	pages = "{94-100}",
    	abstract = "{We present absolute experimental cross sections for removing one and two electrons from He by slow projectiles with charge-states ranging between 11 and 31. The one- (two-) electron removal cross section is found to increase faster (slower) than linear in the charge state q. These effects cannot be accounted for by the extended classical over barrier model. We therefore propose a modification of this model which takes a transfer excitation process (capture by the projectile and excitation of the target) into account. This leads to excellent agreement with the experimental results. True double-electron capture is found to be much less important than transfer ionization in removing both electrons from He in its ground state. We argue that the energy-loss per capture event involving highly charged metal impurity ions and helium in a magnetically confined fusion plasma essentially equals the ionization potential I(q-1) of the highly charged product ion. From a comparative study of experiments using Xe as a target, we infer that the energy loss per capture event might be larger for removal of both electrons from excited He (or other more easily ionized atoms). This effect would be due to the larger tendencies for the intermediate doubly excited states to stabilize radiatively.}",
    	doi = "{10.1088/0031-8949/1991/T37/016}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1991FW88200017}"
    }
    
  123. H CEDERQUIST.
    RADIATIVE STABILIZATION FOLLOWING TRANSFER OF 2 ELECTRONS TO XEQ+(Q LESS-THAN-OR-EQUAL-TO 35) IN SLOW COLLISIONS WITH HE AND XE. ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS 21(S):S99-S104, 1991.
    BibTeX

    @article{ ISI:A1991GK21500019,
    	author = "CEDERQUIST, H",
    	title = "{RADIATIVE STABILIZATION FOLLOWING TRANSFER OF 2 ELECTRONS TO XEQ+(Q LESS-THAN-OR-EQUAL-TO 35) IN SLOW COLLISIONS WITH HE AND XE}",
    	journal = "{ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS}",
    	year = "{1991}",
    	volume = "{21}",
    	number = "{S}",
    	pages = "{S99-S104}",
    	note = "{5TH INTERNATIONAL CONF ON THE ATOMIC PHYSICS OF HIGHLY CHARGED IONS, JUSTUS LIEBIG UNIV, GIESSEN, GERMANY, SEP 10-14, 1990}",
    	abstract = "{We present a derivation of an ECB-based relation between the branching ratio for autoionization F and the ratio between the cross sections for transfer ionization and single-electron capture. We apply this method to two different experimental results. The method yields semi-empirical upper limits for F of unity for double Rydberg levels formed in Xe(q)+-He collisions for charge states up to q = 29. The fact that direct measurements of sigma-TI/(sigma-TI + sigma-DC) leads to values in the range 0.9 < F < 1.0 for the He collisions gives strong support for using the model for the Xe(q)+-Xe results, where no direct measurements of true double-capture cross sections were made. The latter results show a rather strong decrease of the upper limits for F to values significantly below unity for q > 25. We point out that the apparent discrepancy between the results obtained for He and Xe targets at high q could be explained by population of higher angular momentum (l,l') states in the latter case.}",
    	issn = "{0178-7683}",
    	unique-id = "{ISI:A1991GK21500019}"
    }
    
  124. C BIEDERMANN, JC LEVIN, RT SHORT, SB ELSTON, JP GIBBONS, IA SELLIN, H CEDERQUIST, LR ANDERSSON, H ANDERSSON and L LILJEBY.
    TOTAL-CAPTURE CROSS-SECTIONS FOR VERY SLOW AR-4+-AR AND AR-6+-AR COLLISIONS. PHYSICAL REVIEW A 42(11):6905-6908, 1990.
    DOI BibTeX

    @article{ ISI:A1990EM50000069,
    	author = "BIEDERMANN, C and LEVIN, JC and SHORT, RT and ELSTON, SB and GIBBONS, JP and SELLIN, IA and CEDERQUIST, H and ANDERSSON, LR and ANDERSSON, H and LILJEBY, L",
    	title = "{TOTAL-CAPTURE CROSS-SECTIONS FOR VERY SLOW AR-4+-AR AND AR-6+-AR COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1990}",
    	volume = "{42}",
    	number = "{11}",
    	pages = "{6905-6908}",
    	month = "{DEC 1}",
    	doi = "{10.1103/PhysRevA.42.6905}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1990EM50000069}"
    }
    
  125. H CEDERQUIST, C BIEDERMANN, LR ANDERSSON, JC LEVIN, RT SHORT, SB ELSTON, JP GIBBONS, H ANDERSSON, L LILJEBY and IA SELLIN.
    A NEW FACILITY FOR CAPTURE-STATE RESOLVED MEASUREMENTS OF ANGULAR-DISTRIBUTIONS IN VERY SLOW COLLISIONS BETWEEN HIGHLY CHARGED IONS AND ATOMS. PHYSICA SCRIPTA 42(3):332-334, September 1990.
    DOI BibTeX

    @article{ ISI:A1990DW17000013,
    	author = "CEDERQUIST, H and BIEDERMANN, C and ANDERSSON, LR and LEVIN, JC and SHORT, RT and ELSTON, SB and GIBBONS, JP and ANDERSSON, H and LILJEBY, L and SELLIN, IA",
    	title = "{A NEW FACILITY FOR CAPTURE-STATE RESOLVED MEASUREMENTS OF ANGULAR-DISTRIBUTIONS IN VERY SLOW COLLISIONS BETWEEN HIGHLY CHARGED IONS AND ATOMS}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1990}",
    	volume = "{42}",
    	number = "{3}",
    	pages = "{332-334}",
    	month = "{SEP}",
    	doi = "{10.1088/0031-8949/42/3/013}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1990DW17000013}"
    }
    
  126. H ANDERSON, H CEDERQUIST, G ASTNER, P HVELPLUND and JOP PEDERSEN.
    RADIATIVE STABILIZATION OF DOUBLE-RYDBERG STATES FORMED IN SLOW XEQ+-XE (15 LESS-THAN-OR-EQUAL-TO Q LESS-THAN-OR-EQUAL-TO 35) COLLISIONS. PHYSICA SCRIPTA 42(2):150-158, August 1990.
    DOI BibTeX

    @article{ ISI:A1990DT21800006,
    	author = "ANDERSON, H and CEDERQUIST, H and ASTNER, G and HVELPLUND, P and PEDERSEN, JOP",
    	title = "{RADIATIVE STABILIZATION OF DOUBLE-RYDBERG STATES FORMED IN SLOW XEQ+-XE (15 LESS-THAN-OR-EQUAL-TO Q LESS-THAN-OR-EQUAL-TO 35) COLLISIONS}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1990}",
    	volume = "{42}",
    	number = "{2}",
    	pages = "{150-158}",
    	month = "{AUG}",
    	doi = "{10.1088/0031-8949/42/2/006}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1990DT21800006}"
    }
    
  127. J PALINKAS, R SCHUCH, H CEDERQUIST and O GUSTAFSSON.
    EVIDENCE FOR ELECTRON-ELECTRON SCATTERING IN SIMULTANEOUS CAPTURE AND IONIZATION BY 1 MEV PROTONS IN HE. PHYSICA SCRIPTA 42(2):175-179, August 1990.
    DOI BibTeX

    @article{ ISI:A1990DT21800010,
    	author = "PALINKAS, J and SCHUCH, R and CEDERQUIST, H and GUSTAFSSON, O",
    	title = "{EVIDENCE FOR ELECTRON-ELECTRON SCATTERING IN SIMULTANEOUS CAPTURE AND IONIZATION BY 1 MEV PROTONS IN HE}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1990}",
    	volume = "{42}",
    	number = "{2}",
    	pages = "{175-179}",
    	month = "{AUG}",
    	doi = "{10.1088/0031-8949/42/2/010}",
    	issn = "{0281-1847}",
    	researcherid-numbers = "{Palinkas, Jozsef/B-2993-2011}",
    	unique-id = "{ISI:A1990DT21800010}"
    }
    
  128. C BIEDERMANN, H CEDERQUIST, LR ANDERSSON, JC LEVIN, RT SHORT, SB ELSTON, JP GIBBONS, H ANDERSSON, L LILJEBY and IA SELLIN.
    EXPERIMENTAL AND MODEL ANGULAR-DISTRIBUTIONS OF ONE-ELECTRON AND 2-ELECTRON CAPTURE PROCESSES IN 0.5-20 EV U AR4+-AR COLLISIONS. PHYSICAL REVIEW A 41(11):5889-5908, 1990.
    DOI BibTeX

    @article{ ISI:A1990DH69600014,
    	author = "BIEDERMANN, C and CEDERQUIST, H and ANDERSSON, LR and LEVIN, JC and SHORT, RT and ELSTON, SB and GIBBONS, JP and ANDERSSON, H and LILJEBY, L and SELLIN, IA",
    	title = "{EXPERIMENTAL AND MODEL ANGULAR-DISTRIBUTIONS OF ONE-ELECTRON AND 2-ELECTRON CAPTURE PROCESSES IN 0.5-20 EV U AR4+-AR COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1990}",
    	volume = "{41}",
    	number = "{11}",
    	pages = "{5889-5908}",
    	month = "{JUN 1}",
    	doi = "{10.1103/PhysRevA.41.5889}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1990DH69600014}"
    }
    
  129. J PALINKAS, R SCHUCH, H CEDERQUIST and O GUSTAFSSON.
    OBSERVATION OF ELECTRON-ELECTRON SCATTERING IN ELECTRON-CAPTURE BY FAST PROTONS FROM HE. PHYSICAL REVIEW LETTERS 63(22):2464-2467, 1989.
    DOI BibTeX

    @article{ ISI:A1989CA78000008,
    	author = "PALINKAS, J and SCHUCH, R and CEDERQUIST, H and GUSTAFSSON, O",
    	title = "{OBSERVATION OF ELECTRON-ELECTRON SCATTERING IN ELECTRON-CAPTURE BY FAST PROTONS FROM HE}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{1989}",
    	volume = "{63}",
    	number = "{22}",
    	pages = "{2464-2467}",
    	month = "{NOV 27}",
    	doi = "{10.1103/PhysRevLett.63.2464}",
    	issn = "{0031-9007}",
    	researcherid-numbers = "{Palinkas, Jozsef/B-2993-2011}",
    	unique-id = "{ISI:A1989CA78000008}"
    }
    
  130. H CEDERQUIST, L LILJEBY, C BIEDERMANN, JC LEVIN, CSOH ROTHARD, KO GROENEVELD, CR VANE and IA SELLIN.
    STATE-SELECTED ANGULAR-DISTRIBUTIONS OF SINGLE-ELECTRON CAPTURE IN VERY SLOW AR4+-AR COLLISIONS. PHYSICAL REVIEW A 39(8):4308-4311, 1989.
    DOI BibTeX

    @article{ ISI:A1989U317500076,
    	author = "CEDERQUIST, H and LILJEBY, L and BIEDERMANN, C and LEVIN, JC and ROTHARD, CSOH and GROENEVELD, KO and VANE, CR and SELLIN, IA",
    	title = "{STATE-SELECTED ANGULAR-DISTRIBUTIONS OF SINGLE-ELECTRON CAPTURE IN VERY SLOW AR4+-AR COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1989}",
    	volume = "{39}",
    	number = "{8}",
    	pages = "{4308-4311}",
    	month = "{APR 15}",
    	doi = "{10.1103/PhysRevA.39.4308}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1989U317500076}"
    }
    
  131. JC LEVIN, C BIEDERMANN, H CEDERQUIST, CSORT SHORT and IA SELLIN.
    PROPERTIES OF COLD IONS PRODUCED BY SYNCHROTRON RADIATION AND BY CHARGED-PARTICLE IMPACT. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 40-1(Part 1):402-406, April 1989.
    DOI BibTeX

    @article{ ISI:A1989U383800104,
    	author = "LEVIN, JC and BIEDERMANN, C and CEDERQUIST, H and SHORT, CSORT and SELLIN, IA",
    	title = "{PROPERTIES OF COLD IONS PRODUCED BY SYNCHROTRON RADIATION AND BY CHARGED-PARTICLE IMPACT}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1989}",
    	volume = "{40-1}",
    	number = "{Part 1}",
    	pages = "{402-406}",
    	month = "{APR}",
    	doi = "{10.1016/0168-583X(89)91008-2}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1989U383800104}"
    }
    
  132. H CEDERQUIST, H ANDERSSON, G ASTNER, P HVELPLUND and JOP PEDERSEN.
    EVIDENCE FOR RADIATIVE STABILIZATION OF 2-ELECTRON TRANSFER PROCESSES IN SLOW XEQ+-XE (15 LESS-THAN-OR-EQUAL-TO Q LESS-THAN-OR-EQUAL-TO 35) COLLISIONS. PHYSICAL REVIEW LETTERS 62(13):1465-1468, 1989.
    DOI BibTeX

    @article{ ISI:A1989T802500012,
    	author = "CEDERQUIST, H and ANDERSSON, H and ASTNER, G and HVELPLUND, P and PEDERSEN, JOP",
    	title = "{EVIDENCE FOR RADIATIVE STABILIZATION OF 2-ELECTRON TRANSFER PROCESSES IN SLOW XEQ+-XE (15 LESS-THAN-OR-EQUAL-TO Q LESS-THAN-OR-EQUAL-TO 35) COLLISIONS}",
    	journal = "{PHYSICAL REVIEW LETTERS}",
    	year = "{1989}",
    	volume = "{62}",
    	number = "{13}",
    	pages = "{1465-1468}",
    	month = "{MAR 27}",
    	doi = "{10.1103/PhysRevLett.62.1465}",
    	issn = "{0031-9007}",
    	unique-id = "{ISI:A1989T802500012}"
    }
    
  133. JC LEVIN, CS O, H CEDERQUIST, C BIEDERMANN and IA SELLIN.
    IMPORTANCE OF VACANCY CASCADES IN ARGON RECOIL-ION CHARGE-STATE DISTRIBUTIONS ACCOMPANIED BY COINCIDENT PROJECTILE-ELECTRON CAPTURE AND LOSS. PHYSICAL REVIEW A 38(5):2674-2677, 1988.
    DOI BibTeX

    @article{ ISI:A1988P974500054,
    	author = "LEVIN, JC and O, CS and CEDERQUIST, H and BIEDERMANN, C and SELLIN, IA",
    	title = "{IMPORTANCE OF VACANCY CASCADES IN ARGON RECOIL-ION CHARGE-STATE DISTRIBUTIONS ACCOMPANIED BY COINCIDENT PROJECTILE-ELECTRON CAPTURE AND LOSS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1988}",
    	volume = "{38}",
    	number = "{5}",
    	pages = "{2674-2677}",
    	month = "{SEP 1}",
    	doi = "{10.1103/PhysRevA.38.2674}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1988P974500054}"
    }
    
  134. H CEDERQUIST, C BIEDERMANN, JC LEVIN, CS O, IA SELLIN and RT SHORT.
    PRODUCTION OF HIGHLY-CHARGED RECOIL-ION BEAMS AT VERY LOW-ENERGY. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 34(2):243-251, August 1988.
    DOI BibTeX

    @article{ ISI:A1988Q093900016,
    	author = "CEDERQUIST, H and BIEDERMANN, C and LEVIN, JC and O, CS and SELLIN, IA and SHORT, RT",
    	title = "{PRODUCTION OF HIGHLY-CHARGED RECOIL-ION BEAMS AT VERY LOW-ENERGY}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1988}",
    	volume = "{34}",
    	number = "{2}",
    	pages = "{243-251}",
    	month = "{AUG}",
    	doi = "{10.1016/0168-583X(88)90750-1}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1988Q093900016}"
    }
    
  135. H ANDERSSON, G ASTNER and H CEDERQUIST.
    TOTAL CROSS-SECTIONS FOR DIFFERENT CHARGE CHANGING PROCESSES IN COLLISIONS OF HIGHLY CHARGED XE IONS WITH HE ATOMS AT LOW-ENERGY. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 21(8):L187-L193, 1988.
    DOI BibTeX

    @article{ ISI:A1988N291100003,
    	author = "ANDERSSON, H and ASTNER, G and CEDERQUIST, H",
    	title = "{TOTAL CROSS-SECTIONS FOR DIFFERENT CHARGE CHANGING PROCESSES IN COLLISIONS OF HIGHLY CHARGED XE IONS WITH HE ATOMS AT LOW-ENERGY}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1988}",
    	volume = "{21}",
    	number = "{8}",
    	pages = "{L187-L193}",
    	month = "{APR 28}",
    	doi = "{10.1088/0953-4075/21/8/003}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1988N291100003}"
    }
    
  136. IA SELLIN, JC LEVIN, CS O, H CEDERQUIST, SB ELSTON, RT SHORT and H SCHMIDTBOCKING.
    COLD HIGHLY IONIZED IONS - COMPARISON OF ENERGIES OF RECOIL IONS PRODUCED BY HEAVY-IONS AND BY SYNCHROTRON RADIATION X-RAYS. PHYSICA SCRIPTA T22:178-182, 1988.
    DOI BibTeX

    @article{ ISI:A1988P274900028,
    	author = "SELLIN, IA and LEVIN, JC and O, CS and CEDERQUIST, H and ELSTON, SB and SHORT, RT and SCHMIDTBOCKING, H",
    	title = "{COLD HIGHLY IONIZED IONS - COMPARISON OF ENERGIES OF RECOIL IONS PRODUCED BY HEAVY-IONS AND BY SYNCHROTRON RADIATION X-RAYS}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1988}",
    	volume = "{T22}",
    	pages = "{178-182}",
    	doi = "{10.1088/0031-8949/1988/T22/027}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1988P274900028}"
    }
    
  137. JC LEVIN, H CEDERQUIST, CS O, RT SHORT, IA SELLIN, L LILJEBY, S HULDT, SE JOHANSSON, E NILSSON and DA CHURCH.
    PRODUCTION OF VERY COLD, HIGHLY CHARGED IONS BY SYNCHROTRON RADIATION - COMPARISONS OF THE SCALPEL AND HAMMER METHODS. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 262(1):106-109, 1987.
    DOI BibTeX

    @article{ ISI:A1987L265400022,
    	author = "LEVIN, JC and CEDERQUIST, H and O, CS and SHORT, RT and SELLIN, IA and LILJEBY, L and HULDT, S and JOHANSSON, SE and NILSSON, E and CHURCH, DA",
    	title = "{PRODUCTION OF VERY COLD, HIGHLY CHARGED IONS BY SYNCHROTRON RADIATION - COMPARISONS OF THE SCALPEL AND HAMMER METHODS}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT}",
    	year = "{1987}",
    	volume = "{262}",
    	number = "{1}",
    	pages = "{106-109}",
    	month = "{DEC 1}",
    	doi = "{10.1016/0168-9002(87)90197-5}",
    	issn = "{0168-9002}",
    	unique-id = "{ISI:A1987L265400022}"
    }
    
  138. JC LEVIN, RT SHORT, CS O, H CEDERQUIST, SB ELSTON, JP GIBBONS, IA SELLIN and H SCHMIDTBOCKING.
    STEEP DEPENDENCE OF RECOIL-ION ENERGY ON COINCIDENT PROJECTILE AND TARGET IONIZATION IN SWIFT ION-ATOM COLLISIONS. PHYSICAL REVIEW A 36(4):1649-1652, 1987.
    DOI BibTeX

    @article{ ISI:A1987J660400012,
    	author = "LEVIN, JC and SHORT, RT and O, CS and CEDERQUIST, H and ELSTON, SB and GIBBONS, JP and SELLIN, IA and SCHMIDTBOCKING, H",
    	title = "{STEEP DEPENDENCE OF RECOIL-ION ENERGY ON COINCIDENT PROJECTILE AND TARGET IONIZATION IN SWIFT ION-ATOM COLLISIONS}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1987}",
    	volume = "{36}",
    	number = "{4}",
    	pages = "{1649-1652}",
    	month = "{AUG 15}",
    	doi = "{10.1103/PhysRevA.36.1649}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1987J660400012}"
    }
    
  139. P HVELPLUND, A BARANY, H CEDERQUIST and JOK PEDERSEN.
    ENERGY GAIN SPECTROSCOPY STUDIES OF ELECTRON-CAPTURE BY XEQ+ (10-LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-20) IN COLLISIONS WITH NE, AR AND XE. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 20(11):2515-2529, 1987.
    DOI BibTeX

    @article{ ISI:A1987H786900019,
    	author = "HVELPLUND, P and BARANY, A and CEDERQUIST, H and PEDERSEN, JOK",
    	title = "{ENERGY GAIN SPECTROSCOPY STUDIES OF ELECTRON-CAPTURE BY XEQ+ (10-LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-20) IN COLLISIONS WITH NE, AR AND XE}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1987}",
    	volume = "{20}",
    	number = "{11}",
    	pages = "{2515-2529}",
    	month = "{JUN 14}",
    	doi = "{10.1088/0022-3700/20/11/019}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1987H786900019}"
    }
    
  140. H CEDERQUIST, G ASTNER, A BARANY, H DANARED, A JOHNSON, L LILJEBY, KG RENSFELT, S HULDT, P HVELPLUND and H KNUDSEN.
    A MEASUREMENT OF ABSOLUTE CROSS-SECTIONS FOR MULTIELECTRON PROCESSES IN SLOW COLLISIONS BETWEEN HIGHLY CHARGED IONS AND ATOMS. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 24-5(Part 1):43-47, April 1987.
    DOI BibTeX

    @article{ ISI:A1987H243800008,
    	author = "CEDERQUIST, H and ASTNER, G and BARANY, A and DANARED, H and JOHNSON, A and LILJEBY, L and RENSFELT, KG and HULDT, S and HVELPLUND, P and KNUDSEN, H",
    	title = "{A MEASUREMENT OF ABSOLUTE CROSS-SECTIONS FOR MULTIELECTRON PROCESSES IN SLOW COLLISIONS BETWEEN HIGHLY CHARGED IONS AND ATOMS}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1987}",
    	volume = "{24-5}",
    	number = "{Part 1}",
    	pages = "{43-47}",
    	month = "{APR}",
    	doi = "{10.1016/0168-583X(87)90586-6}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1987H243800008}"
    }
    
  141. S MANNERVIK, H CEDERQUIST, I MARTINSON, T BRAGE and CF FISCHER.
    1S2S2PP-25-1S2P3S-5 TRANSITION IN B-II. PHYSICAL REVIEW A 35(7):3136-3138, 1987.
    DOI BibTeX

    @article{ ISI:A1987G960900044,
    	author = "MANNERVIK, S and CEDERQUIST, H and MARTINSON, I and BRAGE, T and FISCHER, CF",
    	title = "{1S2S2PP-25-1S2P3S-5 TRANSITION IN B-II}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1987}",
    	volume = "{35}",
    	number = "{7}",
    	pages = "{3136-3138}",
    	month = "{APR 1}",
    	doi = "{10.1103/PhysRevA.35.3136}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1987G960900044}"
    }
    
  142. S MANNERVIK and H CEDERQUIST.
    MECHANISMS OF CONFIGURATION-INTERACTION IN RELATIVISTIC AUTOIONIZATION - THRESHOLD PHENOMENA AND THE LI4PJ LEVELS - COMMENT. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 19(24):L845-L847, 1986.
    DOI BibTeX

    @article{ ISI:A1986F442400002,
    	author = "MANNERVIK, S and CEDERQUIST, H",
    	title = "{MECHANISMS OF CONFIGURATION-INTERACTION IN RELATIVISTIC AUTOIONIZATION - THRESHOLD PHENOMENA AND THE LI4PJ LEVELS - COMMENT}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1986}",
    	volume = "{19}",
    	number = "{24}",
    	pages = "{L845-L847}",
    	month = "{DEC 28}",
    	doi = "{10.1088/0022-3700/19/24/002}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1986F442400002}"
    }
    
  143. S MANNERVIK, H CEDERQUIST and E TRABERT.
    ON THE EUV SPECTRUM OF LI-I. PHYSICA SCRIPTA 34(2):143-145, August 1986.
    DOI BibTeX

    @article{ ISI:A1986D477800009,
    	author = "MANNERVIK, S and CEDERQUIST, H and TRABERT, E",
    	title = "{ON THE EUV SPECTRUM OF LI-I}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1986}",
    	volume = "{34}",
    	number = "{2}",
    	pages = "{143-145}",
    	month = "{AUG}",
    	doi = "{10.1088/0031-8949/34/2/009}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1986D477800009}"
    }
    
  144. E TRABERT, S MANNERVIK and H CEDERQUIST.
    LIFETIME DIFFERENCES AMONG THE B-2+1S2P24P LEVELS. PHYSICA SCRIPTA 34(1):46-50, July 1986.
    DOI BibTeX

    @article{ ISI:A1986D386300008,
    	author = "TRABERT, E and MANNERVIK, S and CEDERQUIST, H",
    	title = "{LIFETIME DIFFERENCES AMONG THE B-2+1S2P24P LEVELS}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1986}",
    	volume = "{34}",
    	number = "{1}",
    	pages = "{46-50}",
    	month = "{JUL}",
    	doi = "{10.1088/0031-8949/34/1/008}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1986D386300008}"
    }
    
  145. S MANNERVIK, H CEDERQUIST and I MARTINSON.
    EXPERIMENTAL-STUDY OF QUARTET TRANSITIONS IN B-III. PHYSICAL REVIEW A 34(1):231-235, July 1986.
    DOI BibTeX

    @article{ ISI:A1986D154600027,
    	author = "MANNERVIK, S and CEDERQUIST, H and MARTINSON, I",
    	title = "{EXPERIMENTAL-STUDY OF QUARTET TRANSITIONS IN B-III}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1986}",
    	volume = "{34}",
    	number = "{1}",
    	pages = "{231-235}",
    	month = "{JUL}",
    	doi = "{10.1103/PhysRevA.34.231}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1986D154600027}"
    }
    
  146. A BARANY, H DANARED, H CEDERQUIST, P HVELPLUND, H KNUDSEN, JOK PEDERSEN, CL COCKE, LN TUNNELL, W WAGGONER and JP GIESE.
    STUECKELBERG ANGULAR SCATTERING OSCILLATIONS IN 2-ELECTRON CAPTURE BY C-4+ FROM HE AT LOW ENERGIES. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 19(11):L427-L431, 1986.
    DOI BibTeX

    @article{ ISI:A1986D011100008,
    	author = "BARANY, A and DANARED, H and CEDERQUIST, H and HVELPLUND, P and KNUDSEN, H and PEDERSEN, JOK and COCKE, CL and TUNNELL, LN and WAGGONER, W and GIESE, JP",
    	title = "{STUECKELBERG ANGULAR SCATTERING OSCILLATIONS IN 2-ELECTRON CAPTURE BY C-4+ FROM HE AT LOW ENERGIES}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1986}",
    	volume = "{19}",
    	number = "{11}",
    	pages = "{L427-L431}",
    	month = "{JUN 14}",
    	doi = "{10.1088/0022-3700/19/11/008}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1986D011100008}"
    }
    
  147. S MANNERVIK and H CEDERQUIST.
    SPIN-INDUCED QUENCHING OF THE RADIATIVE DECAY OF QUASI-BOUND LI-I QUARTETS ABOVE THE 1S2S S-3 (LI+) THRESHOLD. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 19(9):L297-L302, 1986.
    DOI BibTeX

    @article{ ISI:A1986C685500001,
    	author = "MANNERVIK, S and CEDERQUIST, H",
    	title = "{SPIN-INDUCED QUENCHING OF THE RADIATIVE DECAY OF QUASI-BOUND LI-I QUARTETS ABOVE THE 1S2S S-3 (LI+) THRESHOLD}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1986}",
    	volume = "{19}",
    	number = "{9}",
    	pages = "{L297-L302}",
    	month = "{MAY 14}",
    	doi = "{10.1088/0022-3700/19/9/001}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1986C685500001}"
    }
    
  148. L LILJEBY, G ASTNER, A BARANY, H CEDERQUIST, H DANARED, S HULDT, P HVELPLUND, A JOHNSON, H KNUDSEN and KG RENSFELT.
    ABSOLUTE CROSS-SECTIONS FOR MULTIELECTRON PROCESSES IN SLOW ARQ++NE, AR, KR COLLISIONS. PHYSICA SCRIPTA 33(4):310-320, April 1986.
    DOI BibTeX

    @article{ ISI:A1986A971500005,
    	author = "LILJEBY, L and ASTNER, G and BARANY, A and CEDERQUIST, H and DANARED, H and HULDT, S and HVELPLUND, P and JOHNSON, A and KNUDSEN, H and RENSFELT, KG",
    	title = "{ABSOLUTE CROSS-SECTIONS FOR MULTIELECTRON PROCESSES IN SLOW ARQ++NE, AR, KR COLLISIONS}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1986}",
    	volume = "{33}",
    	number = "{4}",
    	pages = "{310-320}",
    	month = "{APR}",
    	doi = "{10.1088/0031-8949/33/4/005}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1986A971500005}"
    }
    
  149. E TRABERT, S MANNERVIK and H CEDERQUIST.
    BEAM-FOIL STUDY OF THE 2S02P4 3P LEVEL OF N+. PHYSICA SCRIPTA 33(3):222-225, March 1986.
    DOI BibTeX

    @article{ ISI:A1986A421900007,
    	author = "TRABERT, E and MANNERVIK, S and CEDERQUIST, H",
    	title = "{BEAM-FOIL STUDY OF THE 2S02P4 3P LEVEL OF N+}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1986}",
    	volume = "{33}",
    	number = "{3}",
    	pages = "{222-225}",
    	month = "{MAR}",
    	doi = "{10.1088/0031-8949/33/3/007}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1986A421900007}"
    }
    
  150. EH NIELSEN, LH ANDERSEN, A BARANY, H CEDERQUIST, J HEINEMEIER, P HVELPLUND, H KNUDSEN, KB MACADAMS and J SORENSEN.
    ENERGY-GAIN SPECTROSCOPY OF STATE-SELECTIVE ELECTRON-CAPTURE FOR MULTIPLY CHARGED AR RECOIL IONS. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 18(9):1789-1808, 1985.
    DOI BibTeX

    @article{ ISI:A1985AHN1400014,
    	author = "NIELSEN, EH and ANDERSEN, LH and BARANY, A and CEDERQUIST, H and HEINEMEIER, J and HVELPLUND, P and KNUDSEN, H and MACADAMS, KB and SORENSEN, J",
    	title = "{ENERGY-GAIN SPECTROSCOPY OF STATE-SELECTIVE ELECTRON-CAPTURE FOR MULTIPLY CHARGED AR RECOIL IONS}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1985}",
    	volume = "{18}",
    	number = "{9}",
    	pages = "{1789-1808}",
    	doi = "{10.1088/0022-3700/18/9/014}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1985AHN1400014}"
    }
    
  151. H CEDERQUIST, LH ANDERSEN, A BARANY, P HVELPLUND, H KNUDSEN, EH NIELSEN, JOK PEDERSEN and J SORENSEN.
    STATE-SELECTIVE SINGLE-ELECTRON AND DOUBLE-ELECTRON CAPTURE PROCESSES IN SLOW C-4+ + HE, NE, AR AND XE COLLISIONS. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 18(19):3951-3969, 1985.
    DOI BibTeX

    @article{ ISI:A1985ASX6000017,
    	author = "CEDERQUIST, H and ANDERSEN, LH and BARANY, A and HVELPLUND, P and KNUDSEN, H and NIELSEN, EH and PEDERSEN, JOK and SORENSEN, J",
    	title = "{STATE-SELECTIVE SINGLE-ELECTRON AND DOUBLE-ELECTRON CAPTURE PROCESSES IN SLOW C-4+ + HE, NE, AR AND XE COLLISIONS}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1985}",
    	volume = "{18}",
    	number = "{19}",
    	pages = "{3951-3969}",
    	doi = "{10.1088/0022-3700/18/19/017}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1985ASX6000017}"
    }
    
  152. A BARANY, G ASTNER, H CEDERQUIST, H DANARED, S HULDT, P HVELPLUND, A JOHNSON, H KNUDSEN, L LILJEBY and KG RENSFELT.
    ABSOLUTE CROSS-SECTIONS FOR MULTI-ELECTRON PROCESSES IN LOW-ENERGY ARQ+-AR COLLISIONS - COMPARISON WITH THEORY. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 9(4):397-399, 1985.
    DOI BibTeX

    @article{ ISI:A1985ANW4600011,
    	author = "BARANY, A and ASTNER, G and CEDERQUIST, H and DANARED, H and HULDT, S and HVELPLUND, P and JOHNSON, A and KNUDSEN, H and LILJEBY, L and RENSFELT, KG",
    	title = "{ABSOLUTE CROSS-SECTIONS FOR MULTI-ELECTRON PROCESSES IN LOW-ENERGY ARQ+-AR COLLISIONS - COMPARISON WITH THEORY}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1985}",
    	volume = "{9}",
    	number = "{4}",
    	pages = "{397-399}",
    	doi = "{10.1016/0168-583X(85)90332-5}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1985ANW4600011}"
    }
    
  153. P HVELPLUND, LH ANDERSEN, A BARANY, H CEDERQUIST, J HEINEMEIER, H KNUDSEN, KB MACADAM, EH NIELSEN and J SORENSEN.
    ENERGY-GAIN SPECTROSCOPY STUDIES OF STATE-SELECTIVE ELECTRON-CAPTURE FOR MULTIPLY CHARGED AR RECOIL IONS - COMPARISON WITH THE EXTENDED CLASSICAL BARRIER MODEL. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 9(4):421-425, 1985.
    DOI BibTeX

    @article{ ISI:A1985ANW4600017,
    	author = "HVELPLUND, P and ANDERSEN, LH and BARANY, A and CEDERQUIST, H and HEINEMEIER, J and KNUDSEN, H and MACADAM, KB and NIELSEN, EH and SORENSEN, J",
    	title = "{ENERGY-GAIN SPECTROSCOPY STUDIES OF STATE-SELECTIVE ELECTRON-CAPTURE FOR MULTIPLY CHARGED AR RECOIL IONS - COMPARISON WITH THE EXTENDED CLASSICAL BARRIER MODEL}",
    	journal = "{NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}",
    	year = "{1985}",
    	volume = "{9}",
    	number = "{4}",
    	pages = "{421-425}",
    	doi = "{10.1016/0168-583X(85)90338-6}",
    	issn = "{0168-583X}",
    	unique-id = "{ISI:A1985ANW4600017}"
    }
    
  154. S MANNERVIK and H CEDERQUIST.
    ABSOLUTE TERM ENERGIES OF CORE-EXCITED DOUBLETS OF LI-I DETERMINED EXPERIMENTALLY. PHYSICA SCRIPTA 31(1):79-82, 1985.
    DOI BibTeX

    @article{ ISI:A1985ABX7100013,
    	author = "MANNERVIK, S and CEDERQUIST, H",
    	title = "{ABSOLUTE TERM ENERGIES OF CORE-EXCITED DOUBLETS OF LI-I DETERMINED EXPERIMENTALLY}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1985}",
    	volume = "{31}",
    	number = "{1}",
    	pages = "{79-82}",
    	doi = "{10.1088/0031-8949/31/1/013}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1985ABX7100013}"
    }
    
  155. H CEDERQUIST and S MANNERVIK.
    AUTO-IONIZING STATES IN LI-I OBSERVED IN OPTICAL-EMISSION SPECTRA. PHYSICAL REVIEW A 31(1):171-176, 1985.
    DOI BibTeX

    @article{ ISI:A1985TX84400021,
    	author = "CEDERQUIST, H and MANNERVIK, S",
    	title = "{AUTO-IONIZING STATES IN LI-I OBSERVED IN OPTICAL-EMISSION SPECTRA}",
    	journal = "{PHYSICAL REVIEW A}",
    	year = "{1985}",
    	volume = "{31}",
    	number = "{1}",
    	pages = "{171-176}",
    	doi = "{10.1103/PhysRevA.31.171}",
    	issn = "{1050-2947}",
    	unique-id = "{ISI:A1985TX84400021}"
    }
    
  156. H CEDERQUIST, M KISIELINSKI, S MANNERVIK and T ANDERSEN.
    AUTOIONIZATION WIDTHS IN BE-II. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 17(10):1969-1979, 1984.
    DOI BibTeX

    @article{ ISI:A1984ST92600006,
    	author = "CEDERQUIST, H and KISIELINSKI, M and MANNERVIK, S and ANDERSEN, T",
    	title = "{AUTOIONIZATION WIDTHS IN BE-II}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1984}",
    	volume = "{17}",
    	number = "{10}",
    	pages = "{1969-1979}",
    	doi = "{10.1088/0022-3700/17/10/006}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1984ST92600006}"
    }
    
  157. H KNUDSEN, LH ANDERSEN, P HVELPLUND, G ASTNER, H CEDERQUIST, H DANARED, L LILJEBY and KG RENSFELT.
    AN EXPERIMENTAL INVESTIGATION OF DOUBLE IONIZATION OF HELIUM-ATOMS IN COLLISIONS WITH FAST, FULLY STRIPPED IONS. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 17(17):3545-3564, 1984.
    DOI BibTeX

    @article{ ISI:A1984TJ34800024,
    	author = "KNUDSEN, H and ANDERSEN, LH and HVELPLUND, P and ASTNER, G and CEDERQUIST, H and DANARED, H and LILJEBY, L and RENSFELT, KG",
    	title = "{AN EXPERIMENTAL INVESTIGATION OF DOUBLE IONIZATION OF HELIUM-ATOMS IN COLLISIONS WITH FAST, FULLY STRIPPED IONS}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1984}",
    	volume = "{17}",
    	number = "{17}",
    	pages = "{3545-3564}",
    	doi = "{10.1088/0022-3700/17/17/024}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1984TJ34800024}"
    }
    
  158. G ASTNER, A BARANY, H CEDERQUIST, H DANARED, S HULDT, P HVELPLUND, A JOHNSON, H KNUDSEN, L LILJEBY and KG RENSFELT.
    ABSOLUTE CROSS-SECTIONS FOR MULTIELECTRON PROCESSES IN LOW-ENERGY AR-Q+-AR COLLISIONS AS MEASURED WITH A NEW TECHNIQUE. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 17(24):L877-L883, 1984.
    DOI BibTeX

    @article{ ISI:A1984TY41000008,
    	author = "ASTNER, G and BARANY, A and CEDERQUIST, H and DANARED, H and HULDT, S and HVELPLUND, P and JOHNSON, A and KNUDSEN, H and LILJEBY, L and RENSFELT, KG",
    	title = "{ABSOLUTE CROSS-SECTIONS FOR MULTIELECTRON PROCESSES IN LOW-ENERGY AR-Q+-AR COLLISIONS AS MEASURED WITH A NEW TECHNIQUE}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1984}",
    	volume = "{17}",
    	number = "{24}",
    	pages = "{L877-L883}",
    	doi = "{10.1088/0022-3700/17/24/008}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1984TY41000008}"
    }
    
  159. EH NIELSEN, LH ANDERSEN, A BARANY, H CEDERQUIST, P HVELPLUND, H KNUDSEN, KB MACADAM and J SORENSEN.
    ENERGY-GAIN SPECTROSCOPY MEASUREMENTS OF SINGLE-ELECTRON CAPTURE BY AR-6+ IN NE AND AR. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 17(5):L139-L144, 1984.
    DOI BibTeX

    @article{ ISI:A1984SH97700006,
    	author = "NIELSEN, EH and ANDERSEN, LH and BARANY, A and CEDERQUIST, H and HVELPLUND, P and KNUDSEN, H and MACADAM, KB and SORENSEN, J",
    	title = "{ENERGY-GAIN SPECTROSCOPY MEASUREMENTS OF SINGLE-ELECTRON CAPTURE BY AR-6+ IN NE AND AR}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1984}",
    	volume = "{17}",
    	number = "{5}",
    	pages = "{L139-L144}",
    	doi = "{10.1088/0022-3700/17/5/006}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1984SH97700006}"
    }
    
  160. H CEDERQUIST, S MANNERVIK, M KISIELINSKI, P FORSBERG, I MARTINSON, LJ CURTIS and PS RAMANUJAM.
    LIFETIMES OF SOME EXCITED-LEVELS IN CU-I AND CU-II. PHYSICA SCRIPTA T8:104-106, 1984.
    DOI BibTeX

    @article{ ISI:A1984SY96100018,
    	author = "CEDERQUIST, H and MANNERVIK, S and KISIELINSKI, M and FORSBERG, P and MARTINSON, I and CURTIS, LJ and RAMANUJAM, PS",
    	title = "{LIFETIMES OF SOME EXCITED-LEVELS IN CU-I AND CU-II}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1984}",
    	volume = "{T8}",
    	pages = "{104-106}",
    	doi = "{10.1088/0031-8949/1984/T8/017}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1984SY96100018}"
    }
    
  161. S MANNERVIK, H CEDERQUIST and M KISIELINSKI.
    DETERMINATION OF AUTOIONIZATION RATES BY MEANS OF OPTICAL-EMISSION SPECTROSCOPY. PHYSICA SCRIPTA T8:107-111, 1984.
    DOI BibTeX

    @article{ ISI:A1984SY96100019,
    	author = "MANNERVIK, S and CEDERQUIST, H and KISIELINSKI, M",
    	title = "{DETERMINATION OF AUTOIONIZATION RATES BY MEANS OF OPTICAL-EMISSION SPECTROSCOPY}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1984}",
    	volume = "{T8}",
    	pages = "{107-111}",
    	doi = "{10.1088/0031-8949/1984/T8/018}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1984SY96100019}"
    }
    
  162. H CEDERQUIST, M KISIELINSKI and S MANNERVIK.
    EXTRACTION OF ACCURATE AUTOIONIZATION WIDTHS FROM THE EMISSION-SPECTRUM OF DOUBLY-EXCITED HE. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 16(16):L479-L484, 1983.
    DOI BibTeX

    @article{ ISI:A1983RG77700002,
    	author = "CEDERQUIST, H and KISIELINSKI, M and MANNERVIK, S",
    	title = "{EXTRACTION OF ACCURATE AUTOIONIZATION WIDTHS FROM THE EMISSION-SPECTRUM OF DOUBLY-EXCITED HE}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1983}",
    	volume = "{16}",
    	number = "{16}",
    	pages = "{L479-L484}",
    	doi = "{10.1088/0022-3700/16/16/002}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1983RG77700002}"
    }
    
  163. G ASTNER, A BARANY, H CEDERQUIST, H DANARED, P HVELPLUND, A JOHNSON, H KNUDSEN, L LILJEBY and L LUNDIN.
    RECOIL ION EXPERIMENTS IN STOCKHOLM - A PROGRESS REPORT. PHYSICA SCRIPTA T3(SI):163-165, 1983.
    DOI BibTeX

    @article{ ISI:A1983QS34000032,
    	author = "ASTNER, G and BARANY, A and CEDERQUIST, H and DANARED, H and HVELPLUND, P and JOHNSON, A and KNUDSEN, H and LILJEBY, L and LUNDIN, L",
    	title = "{RECOIL ION EXPERIMENTS IN STOCKHOLM - A PROGRESS REPORT}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1983}",
    	volume = "{T3}",
    	number = "{SI}",
    	pages = "{163-165}",
    	doi = "{10.1088/0031-8949/1983/T3/031}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1983QS34000032}"
    }
    
  164. S MANNERVIK and H CEDERQUIST.
    THE QUARTET SYSTEM OF LI-I. PHYSICA SCRIPTA 27(3):175-182, 1983.
    DOI BibTeX

    @article{ ISI:A1983QN47900006,
    	author = "MANNERVIK, S and CEDERQUIST, H",
    	title = "{THE QUARTET SYSTEM OF LI-I}",
    	journal = "{PHYSICA SCRIPTA}",
    	year = "{1983}",
    	volume = "{27}",
    	number = "{3}",
    	pages = "{175-182}",
    	doi = "{10.1088/0031-8949/27/3/006}",
    	issn = "{0281-1847}",
    	unique-id = "{ISI:A1983QN47900006}"
    }
    
  165. H CEDERQUIST and S MANNERVIK.
    ON THE CORE-EXCITED DOUBLETS OF LI-I - ACCURATE DETERMINATION OF AUTOIONIZATION RATES. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 15(22):L807-L812, 1982.
    DOI BibTeX

    @article{ ISI:A1982PR64200005,
    	author = "CEDERQUIST, H and MANNERVIK, S",
    	title = "{ON THE CORE-EXCITED DOUBLETS OF LI-I - ACCURATE DETERMINATION OF AUTOIONIZATION RATES}",
    	journal = "{JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}",
    	year = "{1982}",
    	volume = "{15}",
    	number = "{22}",
    	pages = "{L807-L812}",
    	doi = "{10.1088/0022-3700/15/22/005}",
    	issn = "{0953-4075}",
    	unique-id = "{ISI:A1982PR64200005}"
    }