Xenon Self-Diffusion Near the Critical Point and on the Liquid Branch of the Coexistence Curve

NMR measurements (±{}5%) of self-diffusion in xenon to within 10 ppm of the critical temperature show no anomaly relative to the behavior on the liquid branch of the coexistence curve between 177 and 281^∘{}K. In this lower temperature range we observe ρD∝T^2.74±0.08. This same temperature dependence also describes similar data of Trappeniers and Oosting for the nearly spherical molecule methane.