The 5d96p-5d9(6d+7s) transitions in the isoelectronic sequence Au II-Bi VI

The transitions 5d96d-5d96p and 5d97s-5d96p have been systematically investigated in the spectra of Hg III, Tl IV, Pd V and Bi VI with the support of Slater-Condon type calculations. Energy parameters for 5d96d+5d97s have been determined in a generalized least squares fit from 92 known levels (including 59 new ones) of the Au II-Bi VI isoelectronic sequence. Line strength calculations confirm the classification of 95 lines in Hg III, 75 lines in Ti IV, 91 lines in Pb V and 90 lines in Bi VI. The mixing of both even configurations is important in TlIV only. The 5d96p3P0 levels reported earlier for Tl IV, Pb V and Bi VI have been revised. (orig.)