Revised and Extended Analysis of Nine-Times-Ionized Lanthanum (La X)

Abstract

The lanthanum spectrum was photographed in the 80-1240 Ð region on a variety of vacuum spectrographs using triggered spark sources. The analysis of nine-times ionized lanthanum (La X) has led to revision of four previously identi¢ed levels of the 5s5d con¢guration and established one new level 1 S 0 of the 5s6s con¢guration, four levels of the 5s4f con¢guration, and nine out of twelve levels of the 5p4f con¢guration. The least squares ¢tted parametric (LSF) and Hartree-Fock (HF) calculations interpret the observed spectrum adequately. Fifty eight lines are now classi¢ed in La X, out of which forty ¢ve are new lines.

Ground-state configurations and unresolved transition arrays in extreme ultraviolet spectra of lanthanide ions

“…Currently ground configurations of the lanthanides are known experimentally for ion stages up to the third, and fourth in some cases [2]. As noted in [1], systematic analysis of spectra in higher ion stages of lanthanum and cerium have been performed: La VII [9], La XI [10,11], La XIII [12], Ce III [13], Ce V [14], Ce VI [15], Ce IX [16], Ce X [17] and Ce XIV [10][11][12]. More recently progress has been made in analysing Cd-like ion spectra from Xe VII -Eu XVI [5, 18,19] and Pd-like ion spectra [20].…”

Analysis of the Thirteenth Spectrum of Neodymium, Nd XIII

“…In recent years our laboratories in Antigonish and Troitsk undertook the project of revising and extending Cd-like spectra from Xe VII to higher ions. We established 4f5p, 5p5d and 5s5f configurations in Xe VII -Pr XII ions, 4f5d configuration in La X -Pr XII and 4f 2 configuration in Ce XI and Pr XII [4][5][6][7][8][9][10].…”

Revised and Extended Analysis of the Fifth Spectrum of Tellurium: Te V

“…First, extensive work has been carried out in our laboratory on various tellurium ions from Te III to Te X [3^7] which provided us with a superior tellurium wavelength line list containing Te V lines that was not available almost forty years ago. Second, we have recently studied Cd I isoelectronic sequence spectra of I VI [8], Cs III [9], and La X [10] to which Te V belongs, and established two-electron excited con¢gurations, viz 5p6s and 5p5d. Thus the present investigation is a continuation of our program on the Cd I sequence.…”