ANGULAR-MOMENTUM APPROXIMATION FOR MOLECULAR-COLLISIONS IN THE PRESENCE OF INTENSE LASER-RADIATION

被引:32
作者
DEVRIES, PL
GEORGE, TF
机构
[1] Department of Chemistry, University of Rochester, Rochester, NY
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
D O I
10.1080/00268977900101891
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An approximation to a previously presented rigorous description of molecular (atom-atom) collisions occurring in the presence of intense radiation is investigated. This rigorous description explicitly considers the angular momentum transferred between the molecule and the radiation field in the absorption or emission of a photon, but involves a complicated system of close-coupled equations which must be solved independently for each projection M of the initial, total molecular angular momentum. (This is a direct consequence of the lack of rotational invariance in the molecule- field problem.) These equations are solved for a model system which mimics the collision of a halogen with a rare gas atom. Empirical observations made in the course of performing these calculations lead to the development of an approximation which avoids the repeated calculations for each initial M. This orientational average approximation greatly reduces the effort required to describe the system, and for the model calculation, yields accurate results for field intensities as high as 10 GW cm-2. Further approximations, which truncate the size of the basis set expansion, are also investigated and found to be surprisingly accurate. © 1979 Taylor & Francis Group, LLC.
引用
收藏
页码:561 / 576
页数:16
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