Evaluation of Core Correlation Effects in the 4s4p1P0 State of Calcium

Abstract

In this paper two different approaches are used to study core correlation effects in the 3p64s4p I pO state of calcium. We show that the number of relevant configurational functions in the configuration interaction expansion can be reduced by determining the core correlation functions prior to the valence correlation functions. We also show that core correlation effects of the form 3p2 ~ nP can be represented in the configuration interaction expansion by including configurational functions of the type 3p4(S L) nP(S L){ IS 14s4p in the expansion.