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Argon-broadening coefficients in the ν5 band of acetylene at room and low temperatures

✍ Scribed by Jean-Pierre Bouanich; Jacques Walrand; Ghislain Blanquet

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
188 KB
Volume
219
Category
Article
ISSN
0022-2852

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✦ Synopsis

Ar-broadening coefficients have been measured in the P-and R-branches of the m 5 fundamental band of C 2 H 2 for 30 lines at room temperature and 8 lines at )100 °C, using a tunable diode-laser spectrometer. These lines with J values ranging from 2 to 27 are located in the spectral range 665-795 cm À1 . The collisional widths are obtained by fitting each absorption line with three lineshape models: the Voigt profile, the Rautian profile accounting for the Dicke narrowing effect, and a general Rautian profile including the absorber speed-dependent collisional broadening. The latter model provides significantly larger broadening coefficients than the Voigt model. These coefficients are also calculated from a semiclassical theory performed by using a simple intermolecular potential with two adjustable parameters. Finally, the temperature dependence of the broadening coefficients has been determined both experimentally and theoretically.

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