IT is more or less generally accepted that the various Raman frequencies of a molecule correspond to the oscillations of its component parts with respect to one another, each frequency being associated with one particular mode of oscillation. This conception of the origin of the frequencies is very fruitful in correlating the Raman spectra of molecules with their structure. One particular aspect of the application of this idea has attracted considerable attention during recent years, namely, the assigning of certain frequencies to each type of chemical bond and tracing their variation from compound to compound. We have made a detailed study of the Raman spectra of a number of organic sulphides and we give below the results obtained in two typical cases, ethyl sulphide and allyl sulphide, one representing the saturated and the other the unsaturated compound.
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The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science (1933)