The Raman spectra of liquid (CD 3 ) 3 CH and (CD 3 ) 3 CD were obtained photoelectrically together with depolarization ratios, and the infrared spectra of the corresponding gases were obtained from 3 to 35 μ. A vibrational assignment consistent with depolarization ratios and band contours has been made for the molecules on the basis of C 3v symmetry. The spectra have been correlated with the spectra of (CH 3 ) 3 CH and (CH 3 ) 3 CD and modified assignments for two modes have been given for these molecules. Tentative assignments have been made for the 'inactive' A 2 modes (which are 'active' if the molecule has symmetry C 3 ) to explain some of the observed frequencies around 1000 cm. −1 which could not be satisfactorily assigned as summation or difference tones.
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Wilmshurst et al. (1957) studied this question.