Direct measurements of line-mixing coefficients in the nu(1)+nu(2)Q branch of CO2

被引:26
作者
Berman, R
Duggan, P
Sinclair, PM
May, AD
Drummond, JR
机构
[1] Department of Physics, University of Toronto, Toronto, Ont. M5S 1A7
关键词
D O I
10.1006/jmsp.1996.7226
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
High-resolution measurements of the (nu(1) + nu(2)) Q branch of pure CO2 were made using a difference frequency spectrometer with resolution of 5 x 10(-5) cm(-1) and a signal-to-noise ratio of 2000:1. Lines Q(2) through Q(32) were measured with up to 14 lines in a single spectrum. The analysis of the branch has been performed on data taken at 301 K and pressures less than 11 kPa. The spectra were analyzed on a line-by-line basis within the Rosenkranz approximation of weak overlap [P. W. Rosenkranz, IEEE Trans. Antennas Propagation AP-23, 498 (1975)1. The lineshape profile included Doppler broadening and Dicke narrowing [R. H. Dicke, Phys. Rev. 89, 472 (1953)1 using a modified hard collision model [S. G. Rautian and I. I. Sobel'man, Sov. Phys. Uspekh. 9, 701 (1967)1 with line mixing. For each line the broadening, Dicke narrowing, and line-mixing coefficients were determined. The broadening coefficients are in good agreement with measurements of lines belonging to different CO2 bands. Our measured line-mixing parameters are compared to those predicted by a relaxation matrix which was calculated from an exponential power gap (EPG) law [L. L. Strow, D. C. Tobin, and S. E. Hannon, J. Quant. Spectrosc. Radiat. Transfer 52, 281 (1994)]. The vibrational band intensity and the linear pressure shift of the branch were also measured. (C) 1997 Academic Press.
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收藏
页码:350 / 363
页数:14
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