An experimental study of two-body time correlations in gaseous xenon

The Van Hove scattering function, S(Q,ω), has been measured for xenon gas at five state conditions along the 30 C isotherm using the time-of-flight correlation spectrometer at Oak Ridge National Laboratory (ORNL). The data are normalized by division of S(Q,ω) by the static structure factor so that at each Q value the normalized function has unit area: these curves are bell-shaped and are compared to two kinetic calculations by Dufty and Lindenfeld (unpublished). At the lowest density (0.185×1022 atom/cm3) the experimental data are consistent with the perfect gas and the two models. But at the highest density (0.458×1022 atom/cm3) the data probably differ significantly from these models.