Calculation of doubly-excited energy levels of rare-gas atoms by a frozen-core superposition of configurations method. II. Odd-parity levels of neon and coupling of subshell angular momenta

Abstract

For pt.I see ibid., vol.9, no.14, p.2385 (1976). The authors have calculated 88 doubly-excited energy levels of neon belonging to the 2p43s3p, 2p43s4p, 2p43p4s and 2p43p3d configurations, using a frozen-core superposition of configurations method previously described. The authors' wavefunctions are 'coupling unrestricted' and permit the determination of the best coupling scheme for the subshell angular momenta. For the 2p43s3p configuration, the external electrons are more strongly coupled to each other than to the core. In the 2p43p3d levels a variety of coupling modes are found.