Abstract
The Δn = 0 transition multiplet connecting the lowest quartet states of doubly excited C IV has been studied by beam-foil spectroscopy. The fine structure splittings obtained for the 1s2s2p 4P0 and 1s2p2 4P terms confirm previous experimental results with an improved accuracy. The average transition wavelength λc.g. = (1344.49 ± 0.04)Å is now more precisely determined by about a factor of eight. At the new level of precision this value shows a small but significant deviation from the best theoretical predictions. The lifetimes of the 1s2p2 4P levels have been determined as τ = (0.71 ± 0.07)ns for 4P5/2 and τ = (1.66 ± 0.13)ns for 4P3/2. The latter value disagrees with previous experimental results but is in excellent agreement with an isoelectronic trend analysis.
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