Effect of Exchange Forces on Rotational Lines Broadened by Rare Gases

Abstract

A theory for the molecular collision cross section due to the exchange forces has been developed here following the Anderson—Tsao—Curnutte approach. The width of pure rotational lines of HCl broadened by rare gases has been theoretically calculated using the method developed here. The experimental and theoretical collision cross sections and half-intensity half-linewidths are compared, and in most cases they agree reasonably well.

Molecular Collision Cross Section of the CHF3Molecule Due to Higher Order Interactions

“…A Hamilitonian which describes the exchange interactions between a polar molecule and an anisotropic nonpolar perturber [12] is:…”

“…With such a Hamilitonian (13), Krishnaji [12] worked out a theory of collision broadening caused by exchange interactions. He obtained the following function S exch b:…”

“…Subsequently [9,13], the collision cross-section is: Krishanji and Shrivastava [12], have substituted all the relevant expressions (Eqs. ( 5), ( 10) and ( 13)) into Sb, to account for the inductive, dispersive and exchange interactions, respectively and arrived at a formula for s, the collision cross-sections:…”