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    Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit

    Access Status
    Fulltext not available
    Authors
    Avdonina, N.
    Fursa, Dmitry
    Msezane, A.
    Pratt, R.
    Date
    2005
    Type
    Journal Article
    
    Metadata
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    Citation
    Avdonina, N and Fursa, D and Msezane, A and Pratt, R. 2005. Minima in generalized oscillator strengths of atomic transitions and the approach to the high-energy limit. Physical Review A. 71: pp. 062711-1 - 062711-6.
    Source Title
    Physical Review A
    DOI
    10.1103/PhysRevA.71.062711
    ISSN
    1050-2947
    Faculty
    Faculty of Science and Computing
    Centre of Excellence in Antimatter Studies
    School of Science and Computing
    Faculty of Science and Engineering
    URI
    http://hdl.handle.net/20.500.11937/19770
    Collection
    • Curtin Research Publications
    Abstract

    Minima in the generalized oscillator strength GOS and the convergence of the GOS to the first Born approximation (FBA) limit for the Ba 6s 1S-6p 1P optically allowed transition are investigated. The random phase approximation with exchange, which takes into account correlation effects among the atomic electrons themselves, and the convergent close-coupling CCC approximation are used for the calculations. We find the following. (1) The GOS as a function of the momentum transfer squared K2 is characterized by a complex structure of multiple minima, significantly different in the two approximations and approaches the high-energy FBA limit only at small K2 values (less than about 0.5 a.u.). (2) The number of minima calculated in the CCC approximation increases with increase in energy, but does not correspond to the number obtained in the FBA, even at high energy 1 keV. The CCC and FBA minima are in general not directly related. The FBA minima, except for the first, do not correspond to physical observables at these energies. (3) At high energy the interaction between the incident electron and the target remains significant, resulting in slowing down the convergence of the CCC GOS to the corresponding nonrelativistic FBA results.

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