Far infra-red spectra of molecular crystals

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Abstract
The absorption spectrum of crystalline films of sulphur dioxide has been measured at liquid nitrogen temperature in the region 20 to 400 cm-1 using a Michelson interferometer. Five frequency maxima are observed which are interpreted as due to lattice vibrations. The 101 cm-1 band is assigned as a translational mode. The remaining bands are assigned as torsions: 67 and 79 cm-1 about the out-of-plane (y) axis, and 141 and 160 cm-1 about the in-plane axis (x) of low moment of inertia.