Abstract
Hartree-Fock and configuration interaction (CI) calculations have been performed for the quartet system of C IV. The calculations reveal changes in the level structure compared with the lighter members of the isoelectronic series, primarily among the higher levels. Calculated and observed transition wavelengths agree within 1 AA or less for the shorter wavelengths (200-350AA), whereas significantly larger deviations, up to 30AA, are found for the longer wavelengths (1000-2000AA). A comparison of theoretical and experimental lifetimes for the 1s2s3d 4D and 1s2p2 4P states indicates a significant probability for spin-orbit-induced autoionisation to the doublet continuum in the latter case.
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