title: Effect of removing the no-virtual pair approximation on the correlation energy of the He isoelectronic sequence. II. Point nuclear charge model.
abstract: The correlation energies (CEs) of the He isoelectronic sequence Z=2-116 with a point nuclear charge model were investigated with the four component relativistic configuration interaction method. We obtained CEs with and without the virtual pair approximation which are close to the values from Pestka et al.'s Hylleraas-type configuration interaction calculation. We also found that the uniform charge and point charge models for the nucleus differ substantially for Z > or = 100.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka 812-8581, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Watanabe
authors.forename: Haruyuki
authors.initials: H
authors.lastname: Nakano
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Tatewaki