Abstract
Infrared absorption spectra are reported for the molecules MS, MS 2 and M 2S, where M is Zn, Cd, Mg, Ca or Sr. All of these molecules are unstable in a high temperature vapor. Vapor in equilibrium with solid CaS and SrS contains predominately metal and sulfur atoms. In this investigation the atoms were combined in a low temperature argon matrix in order to form stable molecules. The vapor above ZnS, CdS and MgS contains metal atoms and S 2 molecules. A two stage oven was used to further dissociate the S 2 molecules into atomic sulfur. The triatomic alkaline earth sulfide molecules appear to have the configurations M-S-M and S-M-S. These structures and the vibrational frequencies are fairly well explained using an ionic interatomic potential derived from the diatomic molecule. ZnS 2 and CdS 2, on the other hand, appear to have the structure M-S-S.
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