Abstract
The permanent dipolar contribution to the far-infrared absorption spectra of CO in Ar gas at various densities has been calculated. A non-Markovian spectral theory described in terms of time correlation functions associated to the two first anisotropic orders of the intermolecular potential is used. Comparison with experimental spectra shows that the permament dipolar contribution provides practically the whole absorption at low densities, for which the spectrum exhibits a clear line structure, but not at high densities well after the rotational line structure is missing from the absorption profile.
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