Ar-Broadening of isotropic Raman lines in the ν2 band of acetylene |
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Authors: | JL Domenech F Thibault J-P Bouanich |
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Institution: | a Instituto de Estructura de la Materia, C.S.I.C., Serrano 123, E-28006 Madrid, Spain b Laboratoire de Physique des Atomes Lasers Molécules et Surfaces (UMR-CNRS 6627), Université de Rennes I, Campus de Beaulieu, F-35042 Rennes Cedex, France c Laboratoire de Photophysique Moléculaire (CNRS), Université de Paris Sud Bât. 350, Campus d’Orsay, F-91405 Orsay Cedex, France |
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Abstract: | Using a high resolution Raman spectrometer, we have measured Ar-broadening coefficients in the ν2Q branch of C2H2 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. |
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Keywords: | Acetylene Argon Broadening coefficients Raman spectrum |
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