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

N. Avdonina; D. Fursa; A. Msezane; R. Pratt

doi:10.1103/PhysRevA.71.062711

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

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

N. Avdonina, D. Fursa, A. Msezane and R. Pratt

Physical Review A - Atomic, Molecular, and Optical Physics, Vol.71(6)

2005

DOI: https://doi.org/10.1103/PhysRevA.71.062711

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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.

Details

Title: Minima in generalized oscillator strengths of atomic transitions and the approach to the high-energy limit
Authors/Creators: N. Avdonina (Author/Creator) - University of Alaska Fairbanks
D. Fursa (Author/Creator) - Murdoch University
A. Msezane (Author/Creator) - University of Miami
R. Pratt (Author/Creator) - University of Pittsburgh
Publication Details: Physical Review A - Atomic, Molecular, and Optical Physics, Vol.71(6)
Publisher: The American Physical Society
Identifiers: 991005542267607891
Copyright: © 2005 The American Physical Society
Murdoch Affiliation: School of Engineering Science
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.15 Physical Chemistry; 2.15.664 Dissociative Electron Attachment
Web Of Science research areas: Optics; Physics, Atomic, Molecular & Chemical
ESI research areas: Physics