Raman study of a phase transition in solid trifluoroiodomethane

Abstract

AbstractRaman spectra of solid trifluoroiodomethane are reported for both the lattice and internal mode regions for samples at temperatures between 12 and 130 K. A solid‐state phase transition at about 115 K is confirmed. Above this temperature, the spectra are characteristic of a disordered or highly anharmonic solid. At low temperatures, the spectra are compatible with an ordered, harmonic molecular crystal with a unit cell containing at least four molecules. Plausible assignments of all observed spectroscopic features are proposed.