Electron correlation in excited states and term splittings in the carbonhyphen;I isoelectronic sequence

摘要

The theory of electron correlation in excited states is used in evaluating spectroscopic quantities exemplified by the calculation of term level splittings among excited states of the carbonhyphen;I isoelectronic sequence. Agreement with experiment is generally better than 10percnt;, which is 4ndash;25 times better than that achieved by conventional Hartreehyphen;Fock (HF) calculations and 2ndash;10 times better than that achieved by standard multiconfigurational HF calculations.