RAMAN SPECTRUM OF CRYSTALLINE AND LIQUID SO2

The Raman spectrum of crystalline sulfur dioxide has been recorded at several temperatures between 9 and 185 °K. The main features are in accord with those predicted from the factor group analysis for the known structure of the crystal. Additional peaks were also observed, some arising from isotopic species and lattice fundamentals. As an aid to the assignment of several other bands, the spectrum of the liquid has also been recorded to distinguish the specifically crystalline features. Possible causes of these extra peaks, such as combinations with lattice modes, crystalline defects, and impurities, are briefly discussed.