Tests of QED in two-electron ions. II. The 23S-23P0,1,2energies

For pt.I see ibid., vol.16, no.4, p.507-21 (1982). Examines the use of MCDF calculations to estimate relativity correlation corrections to the 1s2s 3 S 1 -1s2p 3 P 0,1,2 energies of the helium isoelectronic sequence. This is shown to give small but systematic differences from previous estimates based on the Breit-Pauli method. A new method of estimating two-electron corrections to the Lamb shift is described, and the results are compared with earlier estimates and with current experimental data.