Analysis of the (5d(2)+5d6s)-5d6p Transition Arrays of Os VII and Ir VIII, and the 6s (2)S-6p (2)P Transitions of Ir IX

The spectra of osmium and iridium were photographed in the 300 Å to 1600 Å region on a 3 m normal incidence spectrograph using a triggered spark source. The (5d(2) + 5d6s)-5d6p transition arrays of Os VII and Ir VIII were analyzed. All levels of these three configurations in both spectra have been established. There are 77 lines in Os VII and 71 lines in Ir VIII classified. The parametric least squares fitting calculations are used to interpret both spectra. The 6s(2)S(1/2)-6p(2)P(1/2,3/2) transitions in Ir IX have also been identified.