The Spectrum of Molybdenum V

The spectrum of Mo V has been excited in a vacuum spark and photographed with a vacuum spectrograph. With the aid of the irregular doublet law applied to the Sr I-like isoelectronic sequence, lines involving combinations of $4d^2{}_{}{}^3{}_{}{}^{}\mathrm{}\left(\mathrm{FP}\right)\mathrm{}$, $4d5s{}_{}{}^{1,3}{}_{}{}^{}D$, $4d5d{}_{}{}^1{}_{}{}^{}\mathrm{}\left(\mathrm{PD}\right)\mathrm{}$, and $4d5d{}_{}{}^3{}_{}{}^{}\mathrm{}\left(\mathrm{DF}\right)\mathrm{}$ with $4d5p{}_{}{}^{3,1}{}_{}{}^{}\left(F^{\circ }{D}^{\circ }{P}^{\circ }\right)$ and $4d4f{}_{}{}^3{}_{}{}^{}\left(G^{\circ }{F}^{\circ }\right)$, and lying in the spectral region from 2100A to 400A have been identified. Estimates of the absolute term values have been made from a Moseley diagram.