Perturbation theory in calculations of atomic energy levels

Abstract

On the basis of the field form of perturbation theory energy levels of atomic systems with numbers of electrons up to 10 are calculated. Configurations 1s22sn12pn2 (n1=0-2, n2=0-6) are considered. The coefficients Delta E1, Delta E2 in the energy expansion by powers of 1/Z E=E0Z2+ Delta E1Z+ Delta E2+ Delta E3 Z/1... are calculated. Hartree-Fock energies are also represented in the form of a Z-expansion, and the coefficients Delta E1HF, Delta E2HF, Delta E3HF of this expansion are computed. These calculations allow us to represent the correlation energy in the form of a Z-expansion.