Calculations of Autoionizing d^9s^2np Levels in Zn i, Cd i, and Hg i

Abstract

Three Rydberg series of the type d10s21S0−d9s2np. (J = 1) are known in each of these spectra. We have made intermediate-coupling calculations for the configurations Zn i 3d94s24p, 5p; Cd i 4d95s25p, 6p; and Hg i 5d96s27p. The Slater parameters were determined to about 15% accuracy by various methods, or were adopted from previous calculations. Percentage compositions in the LS coupling scheme and in the scheme of highest purity are given for the three levels having J = 1 in each configuration. The results establish the most appropriate designations for these levels and for all of the higher d9s2np series members. Although the Zn i 3d94s24p (J = 1) levels are found to be significantly perturbed, the calculated relative oscillator strengths of the three absorption transitions to these levels agree well with the experimental values. Some other comparisons with experiment are discussed, and the relative intensities of the three observed series within each spectrum are qualitatively explained.