کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5415773 | 1393775 | 2007 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lineshape analysis of the J = 3 â 2 and J = 5 â 4 rotational transitions of room temperature CO broadened by N2, O2, CO2 and noble gases
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Lineshape analysis of the J = 3 â 2 and J = 5 â 4 rotational transitions of room temperature CO broadened by N2, O2, CO2 and noble gases Lineshape analysis of the J = 3 â 2 and J = 5 â 4 rotational transitions of room temperature CO broadened by N2, O2, CO2 and noble gases](/preview/png/5415773.png)
چکیده انگلیسی
Collisional relaxation has been considered for millimeter lines of carbon monoxide at room temperature. Accurate measurements of carbon dioxide- and rare gases-broadened widths have been performed on the J = 3 â 2 rotational line of 12CO by using a video-type spectrometer. Measurements of nitrogen-, oxygen-, and xenon-broadened widths of the J = 5 â 4 rotational line of 13CO were also carried by using a frequency-modulated spectrometer. A lineshape study performed on all the investigated binary systems provide confirmation that Voigt profile is not a suitable model to analyse experimental lines in the millimeter-waves region. On one hand, using this profile in the low pressure range, i.e. in the Doppler regime, the retrieved collisional linewidths do not follow a linear variation with the perturbing gas pressure. On the other hand, regardless of the pressure, lineshapes exhibit a narrowed profile. An accurate analysis of the pressure dependence of relaxation rates show that the Galatry profile is not appropriate and that experimental lineshapes are actually Speed Dependent Voigt profiles. Accurate broadening parameters were retrieved from this profile and compared to previous reported values and predictions calculated from the Robert-Bonamy formalism. Finally a variation of the ratio of relaxation speed dependence to broadening parameters versus relative masses of the collision partners is presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Spectroscopy - Volume 246, Issue 1, November 2007, Pages 86-97
Journal: Journal of Molecular Spectroscopy - Volume 246, Issue 1, November 2007, Pages 86-97
نویسندگان
Jean-Marcel Colmont, Linh Nguyen, François Rohart, Georges Wlodarczak,