The spectrum of yttrium has been observed in a sliding spark discharge at peak currents up to 2000 A on the 10.7 m normal and grazing incidence vacuum spectrographs at NBS . From these observations, the group of 4<i>S</i><sup>2</sup>4<i>p</i><sup>4</sup>-4<i>s</i><sup>4</sup><i>p</i><sup>5</sup> transitions in YVI, which lie in the region 457–766 Å, has been identified and measured, thus yielding values for the 4 levels of the 4<i>s</i>4<i>p</i><sup>5</sup> configuration and revised values for the 5 levels of the 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup> configuration. The energy parameters obtained from a least-squares fit to the observed levels are compared with Hartree-Fock calculations.
© 1976 Optical Society of America
R. Zalubas, J. Reader, and C. H. Corliss, "4s24p4-4s4p5transitions in five-times-ionized yttrium (YVI)," J. Opt. Soc. Am. 66, 35-36 (1976)