Apparent Phase—Transition Effect in the NMR Spin—Spin Relaxation Time Caused by a Distribution of Correlation Times

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Abstract
It is shown that a broad distribution of correlation times produces an apparent‐phase‐transition effect in the NMR spin—spin relaxation time just before the onset of rigid‐lattice behavior. NMR relaxation‐time data for liquid water filling the pores of a charcoal adsorbent provide a sensitive test of the theory. The occurrence of the apparent phase transition for molecules adsorbed on the surfaces of solids provides a method of estimating the spread of activation energies for surfacediffusion and thereby provides a new method for studying the heterogeneity of surfaces.