Extended analysis of the spectrum and term system of He-like carbon

This paper reports an investigation of the spectrum and term system of He-like carbon, C V. A total of 97 lines in the 30-5000 AA interval are now identified by combining previously known data with many newly observed transitions obtained by the beam-foil technique and from observations at the JET tokamak. From this experimental material 48 energy levels are established, and the ionization limit is determined to 3162 408+or-20 cm -1 . The QED contribution to this value is estimated to -166+or-20 cm -1 and agrees, within the error limits, with recent theoretical results. Series formulae are also presented allowing accurate extrapolations of the observed term system.