Multiplets in the Spectra of Cb III and Mo IV

Additional multiplets in the three electron systems of Cb III and Mo IV.—The Moseley law and, one of its consequences, the irregular doublet law are applied to the known data for the triads of quartets ${}_{}{}^4{}_{}{}^{}F{D}^0$, ${}_{}{}^4{}_{}{}^{}F{F}^0$, $F{G}^0$ ($4d^3-4\mathrm{}{d}^{2}5p$) and ${}_{}{}^4{}_{}{}^{}F{D}^0$, ${}_{}{}^4{}_{}{}^{}F{F}^0$, ${}_{}{}^4{}_{}{}^{}F{G}^0$ ($4d^{2}5s-4d^{2}5p$) in Yt I and Zr II to predict the position of the corresponding multiplets in Cb III and Mo IV. Nearly all of the terms in these two triads have been identified. Absolute term values for Cb III differ from those previously given. The lines were photographed with a 3 meter concave grating, first mounted for normal incidence and later for grazing incidence.