Analysis of the Spectra of Pd-like Ions from Xe IX Through Ce XIII

Abstract

The VUV spectra of the Pd-like Xe IX, Cs X, Ba XI, La XII and Ce XIII ions were analyzed. The cascade 4d95s–4d95p–4d95d–4d95f transitions were classified in Ba XI, La XII and Ce XIII ions for the first time. The analysis of the 4d95s–4d95p transitions in Cs X ion was revised and the 4d95p–4d95d–4d95f transitions were classified in Xe IX and Cs X ions. The complete energy structures of the 4d95s, 4d95p and 4d95d configurations and most of the 4d95f energies were determined in every investigated ion. The energy structures of the 4d94f configurations were established by the analysis of the 4d94f–4d95d transitions in Ba XI, La XII and Ce XIII ions for the first time in a Pd I sequence. The experimental results were confirmed by semi-empirical calculations in the frames of Cowan code and Generalized Least-Squares techniques.