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Multispectrum fits for line mixing in the ν3 band Q branch of methane
Authors:A.S. Pine  T. Gabard
Affiliation:a Alpine Technologies, 14401 Poplar Hill Road, Germantown, MD 20874, USA
b Laboratoire de Physique de l’Université de Bourgogne, UMR CNRS 5027, Faculté des Sciences, Miranda, 9, Avenue A. Savary, B.P. 47870, 21078 Dijon Cedex, France
Abstract:First-order line-mixing coefficients and model relaxation matrix element scaling factors have been obtained for allowed transitions in the ν3 band Q branch of CH4 broadened by H2, He, N2, O2, Ar, and CH4. The broadening, shifting, Dicke-narrowing, and line-mixing parameters are determined by simultaneous least-squares fitting of spectra at pressures from 0.014 to 66.66 kPa recorded with a high-resolution difference-frequency laser. These results confirm, improve, and extend a previous analysis of the lower pressure (?13.3 kPa) data [A.S. Pine, J. Chem. Phys. 97 (1992) 773] which yielded averaged coefficients of individually fit spectra where adjacent broadened lines are still partially resolved.
Keywords:Self and foreign gas-broadened methane   Dicke narrowing   Line mixing
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