Infrared absorption spectra of gaseous HD. II. Collision‐induced fundamental band of HD in HD–Ne and HD–Ar mixtures at room temperature

Publisher Website
Google Scholar
Abstract
The collision‐induced infrared absorption spectra of the fundamental band of HD in binary mixtures of HD with Ne and Ar at room temperature have been studied with an absorption path length of 105.2 cm for different base densities of HD in the range 8–20 amagat and a number of total gas densities up to 175 amagat. The observed features of the profiles of the enhancement of absorption in these mixtures resemble closely those of the corresponding profiles of the fundamental band of H2 in binary mixtures with Ne and Ar. The binary absorption coefficients of the band obtained from the measured integrated intensities are (1.84±0.06) ×10−35 and (4.41±0.06) ×10−35 cm6 s−1 for HD–Ne and HD–Ar, respectively. The characteristic half‐width parameters, δd and δc of the overlap transitions and δq (and δq′) of the quadrupolar transitions, are obtained from an analysis of the profiles of the enhancement of absorption in both these mixtures. The quantity δc which is the half‐width of the intercollisional interference dip of the Q branch increases with the density of the perturbing gas Ne or Ar, and for HD–Ne it varies in a manner similar to that for HD–He as described in Paper I of this series.