کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5416232 | 1393807 | 2006 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dicke-narrowed spectral line shapes of CO in Ar: Experimental results and a revised interpretation
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کلمات کلیدی
33.20.Vq33.20.Ea33.70.Jg42.68.Ca39.30.+w - 39.30 + WPressure broadening - افزایش فشارInelastic collisions - برخورد ناپیوستهDicke narrowing - تنگ شدن دیکCollisional narrowing - تنگ شدن لنزInfrared absorption - جذب مادون قرمزSpectral line shape - شکل خط طیفیcarbon monoxide - منوکسیدکربنStatistical correlation - همبستگی آماریTemperature dependence - وابستگی دماCollisional broadening - گسترش گسترده
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The shapes of Dicke-narrowed spectral lines in the fundamental P-branch of CO in Ar are studied by comparing high-resolution measurements and theoretical calculations. The measured spectra were recorded at temperatures between 214 and 324Â K, and at pressures between 0.025 and 1Â atm. The calculations are based on solving a transport/relaxation equation for the appropriate off-diagonal element of the density matrix; they use a realistic intermolecular potential to determine the speed-dependent collisional broadening, and a rigid sphere potential to determine the Dicke narrowing. It is found that the calculations can reproduce the measured spectra within the experimental noise under all conditions, but that the magnitude of the Dicke narrowing in the measured spectra is 70-90% less than predicted from the mass diffusion constant. A revised view of the collision operator resolves the discrepancy in principle, and leads to a better understanding of the line shape problem in general.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Spectroscopy - Volume 235, Issue 1, January 2006, Pages 54-68
Journal: Journal of Molecular Spectroscopy - Volume 235, Issue 1, January 2006, Pages 54-68
نویسندگان
R. Wehr, R. CiuryÅo, A. Vitcu, F. Thibault, J.R. Drummond, A.D. May,