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Line-by-line far-infrared spectra of HCl in dense Ar: Asymmetric profiles.

A previously reported spectral theory [Phys. Rev. A 44, 3023 (1991)] is used to analyze the existence of a highly density-dependent asymmetry in the rotational lines of the far-infrared spectrum of HCl in Ar at 162.5 K and densities between 100 and 480 amagat. This asymmetry is explained in terms of dispersive components due to considering mixing effects between lines. In particular, the rotational lines making up the spectrum have a super-Lorentzian (sub-Lorentzian) shape in the low- (high-) frequency side.