Review of Literature
In the low-frequency range we may find ordinary deformation (strain) vibrations, rotational oscillations of one part of the molecules relative to another (torsional oscillations), and intermolecular vibrations due to specific interactions between molecules, for example, the hydrogen bond. Frequencies characterizing the specific vibrations of molecules with four-membered rings have been observed very recently in the far-infrared. We shall confine ourselves to an analysis of the published data relating to the rotational oscillations. In parallel with results obtained by the Raman method, we have considered it desirable to consider data relating to long-wave infrared absorption spectra.
KeywordsRaman Spectrum Potential Barrier Internal Rotation Torsional Oscillation Dimethyl Sulfide
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