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Relativistic configuration-interaction oscillator strength calculations with ab initio model potential wavefunctions

The relativistic configuration-interaction (CI) method with numerical Dirac–Fock wavefunctions generated using an ab initio model potential with non-integer outermost core shell occupation number to improve the efficiency of the CI representation of core–valence electron correlation, is used to calculate oscillator strengths for the lowest spin-allowed and spin-forbidden ns2 1S 0–nsnp 1P 1, 3P 1 transitions in some systems with two valence electrons. The present results are compared with our earlier data obtained with core–valence correlation represented in the semiclassical core polarization picture.