High-resolution Raman investigation of the vibrational relaxation of two-phonon bound states in solid CO2 at different temperatures
✍ Scribed by P. Ranson; R. Ouillon; S. Califano
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 380 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0377-0486
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✦ Synopsis
The Raman spectra of the bound states a, and 0of the Fermi diad w,:202 in crystalline COz have been measured at several temperatures under very high resolution. Band profiles have been determined for each of the two factor group components, one A, and one F,, of the two states.
The evolution with temperature of the bandwidths has been interpreted in terms of four-phonon decay processes. A single down-process, involving a lattice phonon at 60 cm-', is shown to be sufficient to reproduce the experimental data for the a, state. In the same way, a single up-process, involving the same lattice phonon, is sufficient to fit the experimental data for the fl-state. The variation of the factor group splitting of the acomponent as a function of temperature has also been determined.