Abstract

The spectra of Cs III, Ba IV, and La V have been observed in a sliding spark discharge on the 10.7 m normal-incidence vacuum spectrograph at NBS. Analysis of the observations of Cs III and La V has yielded the energy levels of the 5<i>s</i><sup>2</sup>5<i>p</i><sup>5</sup> and 5<i>s</i>5<i>p</i><sup>6</sup> configurations and nearly all levels of the 5<i>s</i><sup>2</sup>5<i>p</i><sup>4</sup>5<i>d</i> and 5<i>s</i><sup>2</sup>5<i>p</i><sup>4</sup>6<i>s</i> configurations that can combine with the 5<i>s</i><sup>2</sup>5<i>p</i><sup>5</sup><sup>2</sup>P° ground term. The observations for Ba IV have yielded the levels of the 5<i>s</i><sup>2</sup>5<i>p</i><sup>5</sup> and 5<i>s</i>5<i>p</i><sup>6</sup> configurations. The 5<i>s</i><sup>2</sup>5<i>p</i><sup>4</sup>5<i>d</i> + 5<i>s</i><sup>2</sup>5<i>p</i><sup>4</sup>6<i>s</i> + 5<i>s</i>5<i>p</i><sup>6</sup> levels of Cs III and La V have been theoretically interpreted, with configuration interaction included. The energy parameters determined from a least-squares fit to the observed level values are compared with Hartree-Fock calculations. The ionization energies are found to be 33.38 ± 0.25 eV for Cs III, 47.1 ± 0.6 eV for Ba IV, and 61.6 ± 0.6 eV for La V. By extrapolating these values the ionization energy of Ce VI is estimated as 77.6 ± 1.2 eV.

© 1976 Optical Society of America

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