Core polarization corrections to oscillator strengths and singlet-triplet splittings in alkaline earth atoms

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Abstract
An independent particle model of an atom regards the core of filled shells as spherically symmetric, thus neglecting the positive holes induced in the core by the valence electrons. Taking the core- valence interaction as a perturbation, the author obtains formulae for corrections to optical oscillator strengths and single-triplet splittings of atoms with two valence electrons. Neglecting valence-valence correlations, he presents approximate calculations for the core polarization corrections to the lowest (ns)2 to (ns)(np) oscillator strengths and the singlet-triplet splittings of the lowest (ns)(np) configurations of Be, Mg, Ca, Sr and Ba. The core polarization corrections are found to improve significantly agreement between theory and experiment for the larger atoms, namely Ca, Sr and Ba.
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