MBPT Calculation of 1D-3D Splittings in Helium Rydberg States

Self-consistent iteration of Hartree equation is used to obtain orbital wave functions for (different) configurations. These functions build up the basis for ~1D-~3D splittings MBPT calculation of helium 1snd Rydberg states, and the results agree well with the experiments. Due to the lack of ~3D terms in some configurations composed of equivalent electrons, the second- and higher-order corrections for ~1D are asymmetric to those for ~3D.