Line mixing in the ν6 Q branches of self- and nitrogen-broadened methyl bromide - Sorbonne Université Access content directly
Journal Articles Journal of Quantitative Spectroscopy and Radiative Transfer Year : 2008

Line mixing in the ν6 Q branches of self- and nitrogen-broadened methyl bromide

Abstract

Line-mixing effects are studied in the 6 RQK and PQK (K = 0 - 6) branches of CH3Br perturbed by nitrogen. Laboratory Fourier transform spectra have been obtained at room temperature, and for a large range of pressure values of atmospheric interest. In order to accurately model these spectra, a theoretical approach accounting for line-mixing effects is proposed. This model is based on the use of the state-to-state rotational cross-sections calculated by a statistical modified exponential-gap fitting law depending on a few empirical parameters. These parameters are deduced adjusting the calculated diagonal elements of the relaxation matrix to the N2-broadening coefficients, known from accurate previous measurements. Comparisons between experimental and calculated profiles for various Q branches and under various pressure conditions (0.2 - 1 atm), demonstrate the adequacy and consistency of the proposed model. To allow accurate laboratory measurements, line-mixing effects are also modeled in the case of self-perturbed CH3Br.
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Dates and versions

hal-00745909 , version 1 (26-10-2012)

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Ha Tran, David Jacquemart, Jean-Yves Mandin, Nelly Lacome. Line mixing in the ν6 Q branches of self- and nitrogen-broadened methyl bromide. Journal of Quantitative Spectroscopy and Radiative Transfer, 2008, 109 (1), pp.119-131. ⟨10.1016/j.jqsrt.2007.05.003⟩. ⟨hal-00745909⟩
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