Diode laser measurements of self-broadening coefficients in the [nu][sub 5] band of C[sub 2]H[sub 2] at low temperature
Journal Article
·
· Journal of Molecular Spectroscopy; (United States)
- Facultes Univ. N.D. de la Paix, Namur (Belgium.). Lab. de Spectroscopie Moleculaire
- Univ. de Paris-Sud, Orsay (France)
Acetylene is a trace constituent of the earth's atmosphere, mainly produced by anthropogenic sources. The [nu][sub 5] band of C[sub 2]H[sub 2] is very strong and located at the edge of an atmospheric window. It has been suggested that this molecule might play, in a not so distant future, a nonnegligible role in the global climate of this planet. For atmospheric applications, a good knowledge of pressure-broadening coefficients of the spectral lines is required. Here, collisional self-broadening coefficients for 21 lines in the P and R branches of the [nu][sub 5] band of C[sub 2]H[sub 2] at low temperature (173 K) have been measured using a tunable diode laser spectrometer and a low-temperature variable path length absorption cell. These lines, with J values ranging from 1 to 25, are located in the spectral range 670--790 cm[sup [minus]1]. A semiclassical line-broadening calculation provides satisfactory results when the electrostatic interactions arising from the hexadecapole moment of C[sub 2]H[sub 2] are taken into account. The authors have also examined the validity of a simple power law governing the temperature dependence of the broadening coefficients.
- OSTI ID:
- 7043378
- Journal Information:
- Journal of Molecular Spectroscopy; (United States), Journal Name: Journal of Molecular Spectroscopy; (United States) Vol. 165:1; ISSN JMOSA3; ISSN 0022-2852
- Country of Publication:
- United States
- Language:
- English
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