Abstract
AbstractInfrared spectra of solid trifluoroiodomethane, CF3I, at temperatures between 12 and 125 K in both the lattice and internal mode regions are presented and discussed. A reversible phase transition at (115 ± 3) K is confirmed. The upper phase exhibits broad spectral features, characteristic of a disordered or highly anharmonic crystal. At 12 K, the spectra are typical of an ordered harmonic molecular crystal, and are compatible with a centrosymmetric unit cell containing at least four molecules.
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