Estimation of LS-coupling validity within configuration interaction approach

Abstract

Different methods of estimating the LS-coupling validity are compared using the results obtained within the configuration interaction approach. The techniques used earlier and proposed in the present paper were applied to evaluate the validity of LS-coupling for description of energy levels of the ground and excited configurations of ions of the long isoelectronic sequences of carbon, nitrogen, oxygen, fluorine, and scandium. The performed investigation revealed that the methods proposed in present paper provide the more physically-based results.
Keywords: LS-coupling scheme, configuration interaction
PACS: 31.15.Ar, 31.25.Eb, 31.25.Jf