Extended analysis of the spectrum of doubly ionized gold (Au III)

Abstract

The spark spectrum of gold was photographed in the 540–2080 Å region on 10.7 m and 3 m normal incidence spectrographs. The number of classified lines for Au III was increased from 295 to 1040 and 134 new levels were added to the 62 levels of the early analysis. They belong to the doubly excited configurations 5d76s2 and 5d76s6p and to the mixed group 5d8(6d + 7s). Parametric calculations satisfactorily explain the experimental energies. Theoretical transition probabilities are reported for selected strong transitions.