Theoretical line strengths for theresonance transition in the palladium isoelectronic sequence
- 1 December 1980
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 22 (6), 2682-2689
- https://doi.org/10.1103/physreva.22.2682
Abstract
Theoretical line strengths for the resonance transition in the palladium isoelectronic sequence have been computed in three approximations: configuration-averaged Hartree-Fock, term-dependent Hartree-Fock, and many-body perturbation theory. The Hartree-Fock state exhibits pronounced term dependence in the intermediate ionization stages III-XV, with the configuration-averaged radial orbital collapsing more rapidly with than the term-dependent orbital due to the large repulsive exchange interaction with the subshell in the latter. The oscillator strength is small for low ionization stages, and does not reach a maximum until Ba XI. Contracted orbital many-body perturbation theory calculations confirm that, as expected for this closed-shell ground-state system, most of the correlation effects are concentrated in the configuration mixing with the ground state. As a comparison, Hartree-Fock data are also given for the transition . For the state is the lowest-lying in the Pd I sequence.
Keywords
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