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 ≥ 100.