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

Abstract

NMR measurements (\ifmmode\pm\else\textpm\fi{}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\ifmmode^\circ\else\textdegree\fi{}K. In this lower temperature range we observe $\ensuremath{\rho}D\ensuremath{\propto}{T}^{2.74\ifmmode\pm\else\textpm\fi{}0.08}$. This same temperature dependence also describes similar data of Trappeniers and Oosting for the nearly spherical molecule methane.