Theoretical study of two non-Markovian far-infrared spectra of HCl in liquids CCl4 and SF6 using a stochastic model

Abstract The far-infrared spectrum of dilute solutions of HCl in liquids SF 6 and CCl 4 are calculated by two non-Markovian formalisms described in ref. 1 using a Gaussian random field to represent the action of the solvent on a HCl molecule. The theoretical absorption coefficients involve two statistical parameters : the mean square interaction λ 2 and its correlation time t c . In this paper, numerical values for these parameters are obtained by a fit to the available experimental spectra (refs. 8 and 9). These values are compared with those obtained in ref. 4 using a cell model for the liquid : there is a good agreement for HClSF 6 but not for HClCCl 4 .