1. Ar-Broadening of isotropic Raman lines in the <f>ν2</f> band of acetylene
- Author
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Domenech, J.L., Thibault, F., Bermejo, D., and Bouanich, J.-P.
- Subjects
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ACETYLENE , *RAMAN spectroscopy , *BINOMIAL coefficients , *LOW temperatures - Abstract
Using a high resolution Raman spectrometer, we have measured Ar-broadening coefficients in the
ν2 Q branch of C2H2 for 22 lines at 295 K, 20 lines at 174 K, and 16 lines at 134 K. These lines withJ values ranging from 1 to 23 are located in the spectral range 1970.9–1974.3 cm−1. The collisional widths are obtained by fitting each spectral line with a Rautian profile. The resulting broadening coefficients are compared with theoretical values arising from close coupling and coupled states calculations. A satisfactory agreement is obtained at room as well as at low temperatures, especially for oddJ lines. By comparing broadening coefficients at 295, 174, and 134 K from a simple power law, the temperature dependence of these broadenings has been determined both experimentally, and theoretically. [Copyright &y& Elsevier]- Published
- 2004
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