Analysis of the spectrum of the (5d5 + 5d46s)-(5d46p + 5d36s6p) system of triply ionized osmium (Os IV)

The spectrum of osmium was photographed in the 225-2100 A region on a 3-m normal incidence spectrograph using a triggered spark light source and on a 10-m normal incidence spectrograph using a sliding spark source. The (5d5 + 5d46s)-(5d46p + 5d36s6p) transition arrays of Os IV were investigated and 934 lines were classified between 705 A and 1995 A. The analysis has resulted in the determination of 61 levels in the (5d5 + 5d46s) even system and of 124 levels in the 5d46p configuration. Five levels of the 5d36s6p configuration were also identified. The energy levels and their eigenvector compositions have been described by means of the orthogonal operator technique. The 2-particle magnetic operators of the dp-type are compared with values obtained in other spectra. Accurate weighted transition probabilities (gA-values) calculated by means of orthogonal operators are also presented. (orig.)