RAMAN AND INFRARED-SPECTRA OF SOLID CHLOROFLUOROMETHANE

Raman and infrared spectra of solid CH2ClF (Freon 31) were recorded in both the lattice and internal mode regions for samples at temperature s between 12 and 125 K. No evidence of any solid-state phase transitio n was found, but some thin-film samples deposited at low temperatures appear to exist in a metastable phase. Spectra of the stable phase are compatible with a non-centrosymmetric unit cell containing four molec ules. Lattice peaks are assigned on the basis of geometrical and inten sity arguments.