Spectral profiles for atmospheric absorption by isolated lines:: A comparison of model spectra with P- and R-branch lines of CO in N2 and Ar

被引:26
作者
Berman, R [1 ]
Sinclair, PM [1 ]
May, AD [1 ]
Drummond, JR [1 ]
机构
[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1006/jmsp.1999.7887
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
There is a need in atmospheric research to accurately model absorption profiles over a wide range of pressures and temperatures. Here we explore the suitability of four profiles to describe absorption by an isolated line. Three of the profiles, a Lorentzian, a Voigt profile, and a hard-collision model, are speed independent. The fourth profile is an empirical speed-dependent hard-collision model. We test the quality of the profile and the pressure dependence of the broadening by fitting to precise experimental absorption curves for CO broadened by N-2 and Ar. Of the four profiles, we find that only the empirical model is satisfactory. This profile also meets the need of atmospheric modeling in that it is easily evaluated. (C) 1999 Academic Press.
引用
收藏
页码:283 / 290
页数:8
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