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Proceedings Paper

Fourier transform infrared study of a phase transition in solid chlorodifluoromethane
Author(s): A. Anderson; A. J. Beardsall; Jim Fraser
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Paper 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.

Paper Details

Date Published: 31 January 1994
PDF: 2 pages
Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); doi: 10.1117/12.166771
Show Author Affiliations
A. Anderson, Univ. of Waterloo (Canada)
A. J. Beardsall, Univ. of Waterloo (Canada)
Jim Fraser, Univ. of Waterloo (Canada)


Published in SPIE Proceedings Vol. 2089:
9th International Conference on Fourier Transform Spectroscopy

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