Publication
- Names
-
- M. Falk
- E. Whalley
- Title
- Infrared Spectra of Methanol and Deuterated Methanols in Gas, Liquid and Solid Phases
- Abstract
- The infrared spectra of CH$_3$OH, CH$_3$OD, CD$_3$OH, and CD$_3$OD in the five phases gas, liquid, vitreous solid, α-crystal, and (except perhaps for CD$_3$OH and CD$_3$OD for which the solid-solid transitions have not been studied) β‐crystal have been recorded in the range 4000 to 300 cm${−1}$. The Raman spectrum of liquid CD$_3$OH has been recorded. A complete assignment of the internal modes is given, which differs somewhat from previous assignments for the CH$_3$ bending and rocking vibrations. No significant difference in spectrum occurred between the α-crystal and β-crystal phases. Under the full symmetry of the β-phase determined by x-ray diffraction only one OH out-of-plane bending band should occur. Two bands are observed, and it is concluded that the carbon and oxygen atoms in one chain are not coplanar, as is required by the symmetry determined by x-ray diffraction [K. J. Tauer and W. N. Lipscomb, Acta Cryst. 5, 606 (1952)], but that the chains are puckered and the x-ray symmetry arises because the puckered chains are irregularly distributed, a structure that had been previously suggested by Tauer and Lipscomb tentatively on the basis of high apparent thermal amplitudes. Bands occur in the crystal spectra near 500 cm${−1}$ and 340 cm${−1}$ at −180°C. These are interpreted as lattice modes, probably the two infrared-active modes that involve translations of the molecules
- Keywords
- spectroscopy, transmission spectra, Raman, mid-IR, band position, band vibration mode, ices, molecular solids, gas, liquid, amorphous, crystalline, CH3OH, CH3OD, CD3OH, CD3OD
- Content
- spectral data, band list data, experimental physics
- Year
- 1961
- Journal
- Journal of Chemical Physics
- Volume
- 34
- Pages
- 1554 - 1568
- Pages number
- 15
- Document type
- article
- Publication state
- published
- Doi
- 10.1063/1.1701044
- Identifiers
-
- bibcode: 1961JChPh..34.1554F