کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5430765 | 1397418 | 2008 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Line mixing in the ν6Q branches of self- and nitrogen-broadened methyl bromide Line mixing in the ν6Q branches of self- and nitrogen-broadened methyl bromide](/preview/png/5430765.png)
Line-mixing effects are studied in the ν6RQK and PQK (K=0-6) branches of methyl bromide (CH3Br) perturbed by nitrogen (N2). 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 by 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.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 109, Issue 1, January 2008, Pages 119-131