Formal and Approximate Evaluations of a Number of Collision Integrals for Diatomic Molecules

Abstract

Expressions which are exact in the distorted wave Born approximation are derived for a number of kinetic theory collision cross sections, viz. This is done for a number of nonspherical potentials, namely for single-P1 , single-P2, dipole-dipole, dipolequadrupole and quadrupole-quadrupole interactions. A number of additional approximations is used to obtain approximate relations between some of these cross sections and to derive a approximate law of corresponding states. A simple model is described which makes the approximate evaluation of collision cross sections for multipole-multipole interactions very straightforward.