Abstract
We present the theoretical evolution of the far-infrared spectra of HCl in liquid Ar along the Ar liquid-vapour coexistence line obtained from a quantum spectral theory incorporating memory and line mixing effects. The involved time autocorrelation functions associated to the first order anisotropic interaction are calculated by means of classical molecular dynamics techniques. The radial form of the HCl-Ar anisotropic potential is considered as effective in nature with a density-dependent well depth. Numerical results for six Ar thermodynamic states show that the calculated spectra change from those showing a weak, residual rotational structure at high densities and low temperatures to those showing clear, resolved rotational lines as temperature increases and density decreases.
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