Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit
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 atom...
| Main Authors: | , , , |
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| Format: | Journal Article |
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American Physical Society
2005
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| Online Access: | http://hdl.handle.net/20.500.11937/19770 |
| _version_ | 1848750124569722880 |
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| author | Avdonina, N. Fursa, Dmitry Msezane, A. Pratt, R. |
| author_facet | Avdonina, N. Fursa, Dmitry Msezane, A. Pratt, R. |
| author_sort | Avdonina, N. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T07:31:51Z |
| format | Journal Article |
| id | curtin-20.500.11937-19770 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:31:51Z |
| publishDate | 2005 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-197702018-03-29T09:06:32Z Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit Avdonina, N. Fursa, Dmitry Msezane, A. Pratt, R. FBA minima 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. 2005 Journal Article http://hdl.handle.net/20.500.11937/19770 10.1103/PhysRevA.71.062711 American Physical Society restricted |
| spellingShingle | FBA minima Avdonina, N. Fursa, Dmitry Msezane, A. Pratt, R. Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit |
| title | Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit |
| title_full | Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit |
| title_fullStr | Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit |
| title_full_unstemmed | Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit |
| title_short | Minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit |
| title_sort | minima in generalized oscillator strengths of atomic transitions and the approach to thehigh-energy limit |
| topic | FBA minima |
| url | http://hdl.handle.net/20.500.11937/19770 |