Dicke narrowing of the polarized Stokes–Raman Q branch of the v=0→1 transition of D2 in He
Dicke narrowing of the polarized Stokes–Raman Q branch of the v=0→1 transition of D2 in He
复制标题
He 中 D2 v=0→1 跃迁的偏振斯托克斯-拉曼 Q 分支的迪克窄化
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
L. Monchick
中科院分区：
文献类型：
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作者：
R. Blackmore;S. Green;L. Monchick
Ab initio calculations were carried out for several Stokes–Raman Q branch line shapes of the v=0→1 transition of D2 in helium in the low pressure regime where Dicke narrowing is observed. Five different approximations were studied: a generalization of Hess’s method, which is based on the equivalent of a Bhatnagar–Gross–Krook model of the Waldmann–Snider kinetic equation; two high pressure asymptotes of Hess’s method; a moment method of the Chapman–Cowling type due to Corey and McCourt; and a collision kernel method that has found extensive use lately in rarefied gas dynamics and other highly nonequilibrium states. Using generalized cross sections incorporating S‐matrices calculated in the close coupled approximation with an ab initio potential energy surface, most of the methods agreed moderately well with the most recent line width determinations at most densities. Of the five methods, the generalized Hess and collision kernel methods agreed best with experiment over the whole range. At the lowest densit...
