Fourier transform infrared study of a phase transition in solid chlorodifluoromethane

A. Anderson; A. J. Beardsall; Jim Fraser

doi:10.1117/12.166771

31 January 1994 Fourier transform infrared study of a phase transition in solid chlorodifluoromethane

A. Anderson, A. J. Beardsall, Jim Fraser

Proceedings Volume 2089, 9th International Conference on Fourier Transform Spectroscopy; (1994) https://doi.org/10.1117/12.166771
Event: Fourier Transform Spectroscopy: Ninth International Conference, 1993, Calgary, Canada

Abstract

Infrared spectra of solid chlorodifluoromethane (CHClF₂ or Freon 22) at temperatures between 12 K and 105 K have been recorded. Both lattice and internal mode regions have been investigated by utilizing two Fourier transform spectrometers, one for the far-infrared region (20 - 400 cm^-1) and the other for the mid-infrared region (400 - 4000 cm^-1). Evidence for a solid state phase transition at 55 +/- 5 K is presented. Multiplet structure for the nine internal modes is observed over a wide range of temperature and in most cases is shown to result from crystal field rather than isotopic or other effects. This indicates that both phases are ordered with rather large unit cells, and that the phase transition is therefore of a displacive type.

Citation Download Citation

A. Anderson, A. J. Beardsall, and Jim Fraser "Fourier transform infrared study of a phase transition in solid chlorodifluoromethane", Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); https://doi.org/10.1117/12.166771

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