Energy levels of triply ionized carbon (CIV): Polarization method

In a previous publication [Can. J. Phys. 75, 11 (1997)] we calculated the g eneralized polarizabilities up to multipole order 3 as well as certain high er-order hyperpolarizabilities for two-electron atoms and ions of Z = 2-6 a nd 10. In this paper we apply some of these results to calculate excited-st ate energies in three times ionized (lithiumlike) carbon. For states with a ngular momentum L>3 accurate results are obtained using an asymptotic polar izability expansion that includes nonadiabatic effects. Comparison is made with recent optical measurements, and a critical discussion of the correct form of the expansion is given. In addition, the possibility of very accura te measurements of the fine-structure splitting encourages us to present a table of such splittings to very high accuracy. An appendix contains simila r results for lithiumlike oxygen and neon ions. [S1050-2947(99)07610-6].