Vibrational Spectra of the Crystalline Methyl Halides

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Abstract
The infrared spectra of the crystalline methyl halides, CH3Cl, CH3Br, and CH3I, at 80°K are reported. Information on gas-solid frequency shifts, band splittings due to site symmetry and intermolecular coupling, librational frequencies, and relative intensities of band components is summarized and compared. Relative intensities of band components are not in agreement with the predictions of the ``oriented gas'' model. Most other observations are consistent with the assumption of isomorphism between the crystal structures of the three compounds, but the data are not sufficient to prove the isomorphism.