Intermolecular Potentials and Width of Pressure-Broadened Spectral Lines. III. The Rotational Lines of Diatomic Molecules Perturbed by Linear Molecules with High Moment of Inertia

Expressions of the differential cross section for diatomic molecules perturbed by linear molecules with high moment of inertia have been derived using a simplified version of the Anderson theory of line shape. The corresponding validity conditions have been presented. The connection with a ``classical description'' of the rotational degrees of freedom of the perturber has been shown. The cases of HF–CO2, HCl–CS2, and HF–CS2 have been studied as characteristic examples.