Band Systems of MgCl, CaCl and SrCl

A vibrational analysis has been made of band systems due to MgCl, CaCl and SrCl. There are two systems due to MgCl with ${{\nu }_{\mathrm{E}}}^{*}=26,441.5\mathrm{}$, ${\omega }^{\prime }=474.8\mathrm{}$ and ${\omega }^{\prime \prime }=447.4\mathrm{}$ for the more intense system and ${\nu }_{\mathrm{E}}=25,887.2\mathrm{}$, ${\omega }^{\prime }=466.9\mathrm{}$ and ${\omega }^{\prime \prime }=447.4\mathrm{}$ for the less intense system. CaCl has three extensive systems with ${\nu }_{\mathrm{E}}=16,093.5\mathrm{}$, ${\omega }^{\prime }=367.1\mathrm{}$, ${\omega }^{\prime \prime }=364.5\mathrm{}$; ${\nu }_{\mathrm{E}}=16,850.6\mathrm{}$, ${\omega }^{\prime }=361.0\mathrm{}$, ${\omega }^{\prime \prime }=364.0\mathrm{}$; ${\nu }_{\mathrm{E}}=26,498.9\mathrm{}$, ${\omega }^{\prime }=336.0\mathrm{}$, ${\omega }^{\prime \prime }=368.3\mathrm{}$, respectively. There are also three weakly developed systems. Two strong systems of SrCl are observed with the respective constants ${\nu }_{\mathrm{E}}=15,716.9\mathrm{}$, ${\omega }^{\prime }=306.3\mathrm{}$, ${\omega }^{\prime \prime }=301.6\mathrm{}$ and ${\nu }_{\mathrm{E}}=25,245.5\mathrm{}$, ${\omega }^{\prime }=280.4\mathrm{}$, ${\omega }^{\prime \prime }=300.6\mathrm{}$. SrCl has three poorly defined systems as well. The isotope effect due to ${\mathrm{Cl}}^{35}$ and ${\mathrm{Cl}}^{37}$ is observed in all transitions.