Collision-induced spectra of rare gas mixtures: Experimental results and empirical relations

Translational absorption spectra were obtained for He–Kr and He–Xe mixtures at 300 °K and for He–Ar, He–Kr, He–Xe, Ne–Ar, Ne–Kr, and Ne–Xe mixtures at 480 °K. These spectra, as well as other rare gas translational spectra available from the literature, were found to obey a rule of corresponding states when expressed in terms of reduced frequencies and intensities. The peak frequencies and intensities, the half-widths and spectral moments, were found empirically to vary as simple functions of the temperature and could be correlated quantitatively with molecular properties. On the basis of these correlations the characteristics of as yet unmeasured spectra could be predicted.