Abstract
The translational absorption spectrum of Kr–Ar gaseous and liquid mixtures, arising from the collision-induced dipole moment, has been measured in the 13–300 cm−1 frequency region. From the translational band obtained in the gaseous phase we have derived the intensity and the range ρo of the induced dipole moment. The high frequency part of the spectrum observed in the gaseous phase is similar in shape to that observed in the liquid phase. The low frequency part of the spectrum obtained in the latter case is dominated by the intercollisional interference effect and is discussed in terms of a simple model for the motion of the impurities in the liquid. We have also derived the value of the mean square force 〈F2〉 acting on the impurity dissolved in the liquid matrix.
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