Abstract
A new approach to the problem of a quantitative study of the statistical laws governing the formation of the contour of individual bands in the optical absorption spectra of unordered molecular systems (liquids, solutions, liquid crystals, etc.) was developed. The approach is based on a joint consideration of two independent mechanisms of the inhomogeneous broadening of spectral bands; these mechanisms are related to fluctuations of the isotropic and anisotropic components of the total interaction potential of a molecule with the surrounding medium. A generalized expression for the total statistical contour was derived, which made it possible to describe quantitatively the Q-band contour in the vibrational-rotational IR absorption spectrum of a HCl solution in CCl4 at room temperature.
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