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The Raman bands of the C–H ν3 and C–O ν8 stretching modes of liquid methanol have been measured at temperatures ranging from 273 to 363 K and pressures from 10 bar to 4 kbar. The effects of density and temperature on the isotropic linewidth, peak frequency of the isotropic band, ν0 (ISO), and the difference δν between anisotropic ν0(VH) and ν0(ISO) band frequencies are reported and discussed qualitatively in terms of available theoretical models. It appears that repulsive interactions are responsible for the observed C–H line changes, and the Schweizer–Chandler (SC) model is used to evaluate frequency shift and bandwidth of the ν3 C–H mode after the effect of Fermi resonance coupling to the 2ν4 overtone was removed. In particular, the anomalous temperature and density dependence of the Raman band of the C–O stretching mode is noted and compared to the relatively typical behavior observed for the Raman line shape of the C–H mode.

Articles you may be interested inHighpressure Raman studies of liquids and solids of some fluorinated methanes AIP Conf. Proc. 309, 283 (1994); 10.1063/1.46328 Raman noncoincidence effect of the carbonyl stretching mode in compressed liquid cyclic carbonates J. Chem. Phys. 94, 7486 (1991); 10.1063/1.460179 High pressure isotropic bandwidths and frequency shifts of the C-H and C-O modes of liquid methanol High pressure Raman study of vibrational relaxation of the Fermi coupled modes of ammonia J. Chem. Phys. 82, 4007 (1985); 10.1063/1.448840 Infrared and Raman studies of pressure effects on the vibrational modes of solid CO2

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