Superposition of configuration results for oxygen

The earlier Hartree, Hartree and Swirles calculations for oxygen have been repeated with superposition of configurations included in the determination of the wave functions as well as the energy. Results are reported for the 2s2 2pq, q = 0,...4, configurations of O to O4+. In these cases configuration interaction is shown to improve the total energy by less than 0.1%, but may reduce a term interval by almost 50%.