Experimental and theoretical study of the far-infrared spectra of HCl dissolved in liquid Ar, Kr, and Xe

New experimental results are reported on the relative absorption intensity distribution in the FIR spectra of HCl dissolved in liquefied Ar, Kr, and X e at several temperatures along the liquid-vapour coexistence curve. These are treated further by applying a previously developed quantum-statistical spectral theory, which accounts for the line mixing and memory effects. The oretical spectra are given in terms of the anisotropic potential time autoc orrelation functions obtained from classical MD simulations using several e mpirical analytical potentials with density-adjusted well depths. Globally fair agreement between the theoretical and experimental spectra is demonstr ated, except in the high frequency wings, where the theory underestimates t he observed intensities. The choice of a particular radial form for the ani sotropic HCl/RG potentials is found to be not critical for reproducing the experimental absorption profiles.