کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5429165 | 1397337 | 2012 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: N2-broadening coefficients of methyl chloride at room temperature N2-broadening coefficients of methyl chloride at room temperature](/preview/png/5429165.png)
Methyl chloride is of interest for atmospheric applications, since this molecule is directly involved in the catalytic destruction of ozone in the lower stratosphere. In a previous work [Bray et al. JQSRT 2011;112:2446], lines positions and intensities of self-perturbed 12CH335Cl and 12CH337Cl have been studied into details for the 3.4 μm spectral region. The present work is focused on measurement and calculation of N2-broadening coefficients of the 12CH335Cl and 12CH337Cl isotopologues. High-resolution Fourier Transform spectra of CH3Cl-N2 mixtures at room-temperature have been recorded between 2800 and 3200 cmâ1 at LADIR (using a classical source) and between 47 and 59 cmâ1 at SOLEIL (using the synchrotron source on the AILES beamline). 612 mid-infrared transitions of the ν1 band and 86 far-infrared transitions of the pure rotational band have been analyzed using a multispectrum fitting procedure. Average accuracy on the deduced N2-broadening coefficients has been estimated to 5% and 10% in the mid- and far-infrared spectral regions, respectively. The J- and K-rotational dependences of these coefficients have been observed in the mid-infrared region and then a simulation has been performed using an empirical model for 0â¤Jâ¤50, Kâ¤9. The 12CH335Cl-N2 line widths for 0â¤Jâ¤50 and Kâ¤10 of the ν1 band and for 55â¤Jâ¤67 and Kâ¤15 of the pure rotational band have been computed using a semi-classical approach involving exact trajectories and a real symmetric-top geometry of the active molecule. Finally, a global comparison with the experimental and theoretical data existing in the literature has been performed. Similar J- and K-rotational dependences have been appeared while no clear evidence for any vibrational or isotopic dependences have been pointed out.
⺠FTS high-resolution study of methyl chloride at 3.4 μm and in the pure rotational spectral region. ⺠Measurements and theoretical calculations of N2-broadening coefficients of CH3Cl. ⺠J- and K-rotational dependences of symmetric top broadening coefficients. ⺠Line list of calculated N2-broadening coefficients (for 0â¤Jâ¤70 and Kâ¤10) of CH3Cl.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 113, Issue 11, July 2012, Pages 1102-1112