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Raman and far-infrared spectra of the lattice vibrations of solid methanol in the ordered a-phase at 20 K are presented and discussed in terms of the available crystallographic data. Spectra of the deuterated species, CH,OD and CD,OD, have also been recorded to facilitate the assignment of observed peaks. The spectroscopic data are compatible with a centrosymmetric monoclinic unit cell containing four molecules on general sites.

Raman and far infrared spectra of the orthorhombic and cubic phases of acetylene and deuterated acetylene have been obtained. In the orthorhombic phase, three of the four expected librations have been identified in the Raman spectrum and the two infrared active translations have been confirmed, for both samples. In the cubic phase, two of the three predicted librations in the Raman spectrum and the expected pair of translations in the far infrared spectrum have been observed, again for both samples. Splittings in the internal mode Raman spectra are, with one exception, in agreement with the predictions of group theory.

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Raman and infrared spectra of polycrystalline cyanogen, C2N2, at 20 K are reported. Multiplet structure of the intramolecular fundamentals is observed and interpreted in terms of a group theoretical analysis based on the known orthorhombic crystal structure. Seven of the eight predicted librational and five of the predicted six translational modes are observed in the low-frequency regions of the Raman and infrared spectra, respectively.