NUCLEAR-CHARGE EFFECT IN PHOTOELECTRON EJECTION FROM THE 1S2S2P P-4 STATE OF HE-,LI, AND BE+

Citation
Ds. Kim et al., NUCLEAR-CHARGE EFFECT IN PHOTOELECTRON EJECTION FROM THE 1S2S2P P-4 STATE OF HE-,LI, AND BE+, Journal of the Korean Physical Society, 29(4), 1996, pp. 440-446
Citations number
16
Categorie Soggetti
Physics
ISSN journal
03744884
Volume
29
Issue
4
Year of publication
1996
Pages
440 - 446
Database
ISI
SICI code
0374-4884(1996)29:4<440:NEIPEF>2.0.ZU;2-F
Abstract
The photoionization cross sections of Li and Be+ from the excited 1s2s 2p P-4 state, which have not been explored previously, are calculated for ejection of each of the electrons using multi-configuration Hartre e-Fock (MCHF) wave functions and compared with a recent study on the p hotodetachment of He-, focusing on the nuclear charge effect in this i soelectronic sequence. The use of MCHF wave functions is good for Li a nd Be+, but crucial for He-. The behavior of the photoionization cross sections of Li and Be+ are quite different from the photodetachment o f He-. and Be+ also differs from Li. The maximum in the Be+ cross sect ion occurs at the 2s threshold while for Li it is at the 2p threshold. The results are explained in terms of important correlations in the w ave functions and how they are modified as a function of nuclear charg e.