The Band Spectra of SrCl and SrH

The spectra of SrCl and SrH are observed in absorption. The SrCl analysis given by Parker is confirmed. Measurement of the relative intensities of corresponding bands of the electronic doublet ${}_{}{}^2{}_{}{}^{}\Pi \to {}_{}{}^2{}_{}{}^{}\Sigma$ indicates that ${}_{}{}^2{}_{}{}^{}\Sigma$ is the ground state. Rotational analyses of several bands of the $C$ and $D$ systems of SrH lead to values of $B_e$ of 4.008 and 1.925 for the $C$ and $D$ states, respectively. Vibrational analyses of the two systems give ${\omega }_e=1206.2\mathrm{}$, $x_e{\omega }_e=17.0\mathrm{}$ for the $X{}_{}{}^2{}_{}{}^{}\Sigma$ state; ${\omega }_e=1347\mathrm{}$, $x_e{\omega }_e=23.5\mathrm{}$ for the $C{}_{}{}^2{}_{}{}^{}\Sigma$ state and ${\omega }_e=1014.1\mathrm{}$ and $x_e{\omega }_e=15.4\mathrm{}$ for the $D{}_{}{}^2{}_{}{}^{}\Sigma$ state. The perturbations in the $C$ and $D$ states are discussed in terms of the interactions of the $C$, $D$, and $E$ states.