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 4S24p4-4s4p5 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 4s4p5 configuration and revised values for the 5 levels of the 4s24p4 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)