Abstract

The Y v spectrum has been observed in a sliding-spark discharge with the NBS 10.7-m normal-incidence vacuum spectrograph. The analysis has yielded all the levels of the 4<i>p</i><sup>4</sup>5<i>s</i> configuration and nearly all levels of 4<i>p</i><sup>4</sup>4<i>d</i> that can combine with the 4<i>p</i><sup>5 2</sup><i>P</i> ground term. The 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>4<i>d</i> + 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>5<i>s</i>+4<i>s</i>4<i>p</i><sup>6</sup> levels have been theoretically interpreted, including configuration-interaction effects. The 4<i>s</i>4<i>p</i><sup>6</sup><sup>2</sup><i>S</i><sub>½</sub> level was found to have a 26% 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>4<i>d</i>(<sup>1</sup><i>D</i>)<sup>2</sup><i>S</i> character and the 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>4<i>d</i>(<sup>1</sup><i>D</i>)<sup>2</sup><i>S</i><sub>½</sub> level a 22% 4<i>s</i>4<i>p</i><sup>6</sup><sup>2</sup><i>S</i> character. The energy parameters determined from a least-squares fit of the observed level values are compared with Hartree-Fock calculations. The ionization energy is estimated to be 75.0±0.5 eV.

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