Abstract
The far-infrared pure rotational absorption spectrum of HD and HD-/ital X/ mixtures was measured at 77 and 195 K. Specifically, the rotational lines /ital R/(0)--/ital R/(2) were observed for HD-HD, HD-He, HD-Ne, and HD-H/sub 2/ at 77 K and /ital R/(0)--/ital R/(3) for HD-HD, HD-He, and HD-Ar at 195 K. Refined values of the permanent dipole moment of HD are deduced. Collisional interference in the spectrum is characterized by a parameter proportional to the ratio of the average-induced dipole moment to the permanent dipole moment. Its variation with temperature, particularly a change in sign, is not explainable by current theory. The spectral line-shape parameters of width, frequency shift, and asymmetry are determined and their density and temperature behavior discussed with reference to the impact theory of line broadening.
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