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 $\rho D\propto T^{2.74\pm 0.08}$. This same temperature dependence also describes similar data of Trappeniers and Oosting for the nearly spherical molecule methane.