Line profile study from diode laser spectroscopy in the 12CH4 2ν3 band perturbed by N2, O2, Ar, and He
G. Dufour, D. Hurtmans, A. Henry
Sep 1, 2003
Citations
24
Citations
Journal
Journal of Molecular Spectroscopy
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Key Takeaway Key Takeaway: This study reveals that the Dicke effect parameters of the R(0) line in the 12CH4 23 band can be determined using a frequency stabilized tunable diode laser spectrometer, with the ability to estimate absorber speed dependent effects on broadening.
Abstract
Abstract We present a line profile study for two lines in the 2 ν 3 band of CH 4 recorded with a frequency stabilized tunable diode laser spectrometer. The broadening and narrowing (Dicke effect) parameters of the R (0) line perturbed by N 2 , O 2 , and He are derived from a simultaneous fitting of spectra at pressures from 20 to 300 Torr by using the soft and hard collision models. These parameters are determined for the A and F components of the unresolved R (3) manifold perturbed by N 2 , Ar, and He from the line profile analysis of spectra at pressures between 50 and 500 Torr. The line mixing effect between the two F components is also taken into account and the absorber speed dependent effect on broadening is estimated for N 2 and Ar.