Calculations of wavelengths and transition probabilities in the singlet and triplet spectra of N IV

Abstract

Energies, structures, transition wavelengths and probabilities for 1s22snl and 1s22pnl' singlet and triplet terms of N IV are calculated and compared with available experimental data. It is suggested that the 2p4d 1Do and 1Fo terms have been incorrectly identified, that 2p3p 3S lies below 2s4s 3S and that several new and unclassified lines in the beam-foil spectrum of nitrogen are due to transitions from previously unknown 2p4f terms. A tentative assignment is provided for the unclassified line at 259.434 nm.