Intermolecular potential well depths from the temperature dependence of the absorption spectra of gas-phase complexes in HCl–noble gas mixtures

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Abstract
Far infrared spectra of Ar–HC1 and Xe–HCl van der Waals molecules have been determined at various temperatures. A method is developed for analyzing the temperature dependence of the intensities of the absorption lines. Apart from information on the relative positions of the energy levels involved in the observed transitions, the data yield an estimate of D 0, the dissociation energy of the complex: 184±24 cm−1 for Ar–HC1 and 339±33 cm−1 for Xe–HCl.