The Oxygen Spectrum below 200 Å and the High-limit Terms of O IV

The vacuum-spark spectrum of oxygen in the region below 200 Å is described by means of spectrum reproductions and a table of 214 lines from 198 Å to 94 Å, representing O IV, O V, O VI and traces of O VII. The high-limit term systems of O IV are re-examined, and the result is given in a comprehensive list of terms belonging to the limits 2s2p1Pand 2p2 3P,1D,1S.