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An analysis of the resonance interaction between the vibrations v1 and 2v4 in the methyl halide molecules explains the appearance of the very intense extra band in the infrared and Raman spectra of these molecules. This degeneracy is evidently characteristic of the methyl group. A number of molecules involving the methyl group and exhibiting the phenomenon of the extra band are listed.
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Adel et al. (1934) studied this question.
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