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首页> 外文OA文献 >Experimental and theoretical study of line mixing in methane spectra. II. Influence of the collision partner (He and Ar) in the v3 IR band
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Experimental and theoretical study of line mixing in methane spectra. II. Influence of the collision partner (He and Ar) in the v3 IR band

机译：甲烷谱线混合的实验和理论研究。二。 v3 IR波段中碰撞伙伴（He和Ar）的影响

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摘要

Line mixing effects are studied in the v3 band of CH4 perturbed by Ar and He at room temperature. Experiments have been made in the 2800-3200 cm-1 spectral region using four different setups. They cover a wide range of total densities, including low (0.25-2 atm), medium (25-100 atm), and high (200-1000 atm) pressure conditions. Analysis of the spectra demonstrates that the spectral shapes (of the band, the Q branch, the P and R manifolds,...) are significantly influenced by line mixing. The theoretical approach proposed in the preceding paper is used in order to model and analyze these effects. As done previously, semiclassical state-to-state rates are used together with a few empirical constants. Comparisons between measurements and spectra computed with and without the inclusion of line mixing are made. They prove the quality of the approach which satisfactorily accounts for the effects of pressure and of rotational quantum numbers on the spectral shape. It is shown that collisions with He and Ar lead to different line-coupling schemes (e.g., more coupling within the branches and less between branches) and hence to different shapes. The influence of line coupling between different branches and manifolds is evidenced and studied using high pressure spectra and absorption in the band wings. © 1999 American Institute of Physics.
机译：在室温下，在Ar和He干扰的CH4的v3谱带中研究了线混合效应。已经使用4种不同的设置在2800-3200 cm-1光谱范围内进行了实验。它们涵盖了广泛的总密度，包括低压（0.25-2 atm），中压（25-100 atm）和高压（200-1000 atm）。光谱分析表明，谱线的形状（谱带，Q分支，P和R流形等）受线混合的影响很大。为了模拟和分析这些影响，使用了前一篇论文中提出的理论方法。如前所述，半经典状态间速率与一些经验常数一起使用。比较测量结果和有无线路混合情况下计算出的光谱。他们证明了该方法的质量，该方法令人满意地说明了压力和旋转量子数对光谱形状的影响。已经表明，与He和Ar的碰撞导致不同的线耦合方案（例如，在分支内更多的耦合而在分支之间更少的耦合）并因此导致不同的形状。使用高压光谱和带状翼的吸收来证明和研究不同分支和歧管之间的线耦合的影响。 ©1999美国物理研究所。

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