Comments on the Infrared Spectra of SO2 Clathrate-hydrate Formed by Vapor Condensation

Gaseous mixtures having clathrate-hydrate stoichiometries were condensed at 83 °K into an amorphous phase. Infrared spectra were recorded at a series of temperatures up to 180 °K in order to determine the transformation temperature and the nature of the annealed phase. Bands associated with the H2O molecules began to shift position at 125 °K while those attributed to guest molecules decreased to null intensity. There was no evidence of a unique clathrate-hydrate H2O spectrum nor of free or hindered rotation of the guest molecules.