Ar-Broadening of isotropic Raman lines in the ν2 band of acetylene

Using a high resolution Raman spectrometer, we have measured Ar-broadening coefficients in the ν 2 Q branch of C 2H 2 for 22 lines at 295 K, 20 lines at 174 K, and 16 lines at 134 K. These lines with J values ranging from 1 to 23 are located in the spectral range 1970.9–1974.3 cm −1. The collisional...

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Bibliographic Details
Published inJournal of molecular spectroscopy Vol. 225; no. 1; pp. 48 - 54
Main Authors Domenech, J.L, Thibault, F, Bermejo, D, Bouanich, J.-P
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.05.2004
Subjects
Acetylene
Argon
Broadening coefficients
Raman spectrum
Broadening coefficients
Argon
Raman spectrum
Acetylene
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Summary:Using a high resolution Raman spectrometer, we have measured Ar-broadening coefficients in the ν 2 Q branch of C 2H 2 for 22 lines at 295 K, 20 lines at 174 K, and 16 lines at 134 K. These lines with J 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 odd J 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.
ISSN:0022-2852
1096-083X
DOI:10.1016/j.jms.2004.02.010