Raman studies of orientational disorder in crystals: The hexamethylethane plastic phase, T> T c =152 K

Raman spectra of some bands in the plastic phase of hexamethylethane have been recorded as a function of temperature. Interesting features related to the molecular reorientations and librations have been derived from the band shape analysis of F 2g and E g low‐frequency spectra. A novel temperature dependence of the libration width has been observed. The analysis of the internal modes' bandwidths at ν 1 = 878 cm −1 and ν 2 = 475 cm −1 provides consistent results for the monomolecular reorientational dynamics.