Strontium Deuteride and Hydride Spectra

Abstract

The analyses of the $B$ and $C$ band systems of SrD and of a portion of the $D$ system of SrH are presented. $B_e^{}{}_{}{}^{*}=1.9427\mathrm{}$ for SrD and 3.8788 for SrH for the normal ${}_{}{}^2{}_{}{}^{}\Sigma$ state. The ratio of these, 0.50635, shows about the expected departure from equality with the ratio ${\rho }^2=0.50603\mathrm{}$ of the reduced masses. The spin doubling of this SrD state is regular, ${\gamma }_0=+0.0613\mathrm{}$ being almost exactly in the ratio ${\rho }^2$ with the value for SrH. The spin doubling of the $B{}_{}{}^2{}_{}{}^{}\Sigma$ state of SrD departs markedly from the usual linear variation with $K+\frac{1}{2}$. Multiple perturbations occur in the (0,0) $C$ band of SrD, and there is a sharp cut-off of the branches at $K^{\prime }=29\mathrm{}$. For this $C{}_{}{}^2{}_{}{}^{}\Sigma$ state $B_0\cong 1.95$, but exact analysis is hindered by the lack of any unperturbed lines. Two bands ($v^{\prime },2\mathrm{}$) and ($v^{\prime },3\mathrm{}$), with a common upper state, of the $D{}_{}{}^2{}_{}{}^{}\Sigma \to N{}_{}{}^2{}_{}{}^{}\Sigma$ "many-lined" SrH system have been analyzed. In this $D$ state, for which $B_v=1.913\mathrm{}$, large irregular perturbations occur. Electronic configurations are discussed.