Self-broadening coefficients in the ν7 band of ethylene at room and low temperatures

G. Blanquet, J. Walrand, J.-P. Bouanich, M. Lepère

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Using a tunable diode-laser spectrometer, we have measured self-broadening coefficients for a few transitions in the ν fundamental band of CH at 298 and 174 K. The studied transitions J′,K′,K′← J, K, K with 3 ≤ J ≤ 17, 1 ≤ K ≤ 4, and 1 ≤ K ≤ 14 are located in the spectral range 919-982 cm . The collisional widths are measured by fitting each spectral line with Voigt, Rautian, and speed-dependent Rautian profiles. The latter model provides larger broadening coefficients than the Rautian profile and still larger coefficients than the Voigt profile. An approximate semiclassical calculation performed by considering only electrostatic interactions leads to reasonable agreement with the experimental data. By comparing the results obtained at room and low temperatures, the temperature dependence of the self-broadening has been determined both experimentally and theoretically.
langue originaleAnglais
Pages (de - à)284-290
Nombre de pages7
journalJournal of molecular spectroscopy
Numéro de publication2
Les DOIs
Etat de la publicationPublié - 1 déc. 2003

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