An angular momentum approximation for molecular collisions in the presence of intense laser radiation
Abstract
An approximation to a previously presented rigorous description of molecular (atomatom) 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 closecoupled 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 moleculefield 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 cm2. Further approximations, which truncate the size of the basis set expansion, are also investigated and found to be surprisingly accurate.
 Publication:

Molecular Physics
 Pub Date:
 1979
 DOI:
 10.1080/00268977900101891
 Bibcode:
 1979MolPh..38..561D
 Keywords:

 Angular Momentum;
 Laser Outputs;
 Mathematical Models;
 Molecular Collisions;
 Photoabsorption;
 Photoelectric Emission;
 Approximation;
 Halogens;
 Rare Gases;
 Atomic and Molecular Physics