Abstract
This paper reports an investigation of the spectrum and term system of Li-like carbon, C IV. Between 200 and 7750 Å a total of 105 C IV lines have been identified by combining previously known data with new spectra recorded by the beam-foil technique and from observations at the JET tokamak. A comprehensive term system, with accurate energies for all levels up to n = 12, is constructed from the identified transitions. Semiempirical series formulae are also given, allowing reliable extrapolations to still higher n values. The ionization energy is determined to (520 175.3 ± 1.5) cm−1, which confirms recent theoretical predictions that include quantum electrodynamical (QED) corrections.
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