INTERCOLLISIONAL INTERFERENCE EFFECT IN THE LIGHT-SCATTERING SPECTRUMOF XENON GAS

The depolarized, interaction-induced light scattering spectrum of xeno n gas at room temperature has been measured in the very low frequency region, by means of a high resolution, high contrast monochromator. In addition to the accurate determination of the bound dimers band, a po sitive contribution in excess of the calculated pair spectrum is obser ved at lower frequency. A density analysis of this intensity excess sh ows that we have measured, for the first time, the intercollisional in terference effect long ago predicted by Lewis and Van Kranendonk [Phys . Rev. Lett. 24, 802 (1970)].