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    Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states

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    Authors
    Müller, A.
    Borovik, A.
    Huber, K.
    Schippers, S.
    Fursa, Dmitry
    Bray, Igor
    Date
    2018
    Type
    Journal Article
    
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    Citation
    Müller, A. and Borovik, A. and Huber, K. and Schippers, S. and Fursa, D. and Bray, I. 2018. Indirect contributions to electron-impact ionization of Li+ (1s2s S1 3) ions: Role of intermediate double- K -vacancy states. Physical Review A - Atomic, Molecular, and Optical Physics. 97 (2): Article ID 022709.
    Source Title
    Physical Review A - Atomic, Molecular, and Optical Physics
    DOI
    10.1103/PhysRevA.97.022709
    ISSN
    2469-9926
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/68032
    Collection
    • Curtin Research Publications
    Abstract

    Fine details of the cross section for electron-impact ionization of metastable two-electron Li+ (1s2s 3S1) ions are scrutinized by both experiment and theory. Beyond direct knockoff ionization, indirect ionization mechanisms proceeding via formation of intermediate double-K-vacancy (hollow) states either in a Li+ ion or in a neutral lithium atom and subsequent emission of one or two electrons, respectively, can contribute to the net production of Li2+ ions. The partial cross sections for such contributions are less than 4% of the total single-ionization cross section. The characteristic steps, resonances, and interference phenomena in the indirect ionization contribution are measured with an experimental energy spread of less than 0.9 eV and with a statistical relative uncertainty of the order of 1.7%, requiring a level of statistical uncertainty in the total single-ionization cross section of better than 0.05%. The measurements are accompanied by convergent-close-coupling calculations performed on a fine energy grid. Theory and experiment are in remarkable agreement concerning the fine details of the ionization cross section. Comparison with previous R-matrix results is less favorable.

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