Study of collision-induced rotational perturbations in gases via the wing shape of infrared bands

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Abstract
A theoretical analysis of the infrared absorption band wings is presented. The wing shape is expressed in terms of the spectral density of rotational perturbations experienced by absorbing molecules in moderately dense gases. The developed formalism is applied to the absorption in the high-frequency wing of the ν3 CO2 band. Analytical approximation of the experimental rotational perturbation densities is used to deduce the rotational relaxation parameters as well as the mean square torques, which provide information on the short-range anisotropic intermolecular interactions.
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