Multiconfiguration calculation of the oxygenP3ground-state fine structure

Abstract

The fine structure of the oxygen ${}_{}{}^3{}_{}{}^{}P$ ground state is computed using a rather simple multiconfiguration wave function. The approach is similar to that used in previously reported fine-structure calculations for the lowest nitrogen ${}_{}{}^2{}_{}{}^{}D$ and ${}_{}{}^2{}_{}{}^{}P$ states, and similar results are obtained, accounting for about 80% of the difference between the Hartree-Fock result for the spin-orbit coupling parameter and the value indicated by experiment. The contribution due to spin-spin coupling is also considered.