Abstract

The fundamental infrared spectra (2700–3100 cm −1) of dilute solutions of HCl in liquid SF 6 at temperatures between 218 and 316 K have been calculated by applying a spectral theory based on the decomposition of the rotational motion of the diatomic molecule into two limiting cases: quasi-free rotation and rotational diffusion. From comparison between theoretical and experimental spectra it is possible to deduce quantitative values for a reduced set of statistical parameters involved in the theory and to analyze their behaviour as a function of the solvent temperature. The connection between the rotational structure appearing in these spectra and the parameters is discussed.

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