Analysis of the He-Xe absorption spectrum in the far infrared

An analysis of the binary collision-induced absorption spectrum of helium-xenon mixtures is presented, based on a refined interaction potential and quantum line-shape calculations. This line-shape analysis is more discriminating than a previous analysis in terms of spectral integrals and sum formulas. An improved empirical interaction-induced dipole moment of He-Xe pairs is of the ‘‘exponential plus ${\mathit{D}}_7$/${\mathit{R}}^7$ dispersion’’ form, where both parts are significant for the agreement of measured and calculated spectral profiles. © 1996 The American Physical Society.