Xw. Zhu et Kt. Chung, ENERGIES, FINE-STRUCTURES AND OSCILLATOR-STRENGTHS OF 1S(2)2P(2) S-1,D-1 AND P-3(2,1,0) STATES OF BE-LIKE IONS, Physica scripta. T, 52(6), 1995, pp. 654-664
The energies and wave functions of the 1s(2)2p(2 1)S, P-3 and D-1 stat
es are calculated with a full-core plus correlation method (FCPC) for
ions from B II to Ne VII, Mg IX and Si XI. A restricted variational me
thod is used to extrapolate a better nonrelativistic energy. The relat
ivistic correction and fine structures are calculated with first-order
perturbation theory. Higher order effects are estimated. The oscillat
or strengths for 1s(2)2snp (n = 2, 3) P-1(o)-1s(2)2p(2 1)S, D-1 and fo
r 1s(2)2snp (n = 2, 3) P-3(o)-1s(2)2p(2 3)P are calculated. The result
s are compared with available theoretical and experimental data in the
literature. The excitation energies predicted in this work are slight
ly higher than the precision experiment. For example, for D-1, it is h
igher by 8.5 cm(-1) for Z = 4 and the discrepancy increases to 149 cm(
-1) for Z = 14. The dipole-length, -velocity and -acceleration oscilla
tor strengths calculated in this work agree well with each other. Howe
ver, some discrepancies still exist between the predicted oscillator s
trengths and experiment.