CiteULike: dchen's Gezelter http://www.citeulike.org/user/dchen/author/Gezelter CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2582904 <i>Physical Review Letters, Vol. 82, No. 18. (3 May 1999), 3649.</i><br /><br />We report on the direct observation of stretched exponential relaxation in low-temperature monatomic Lennard-Jones systems which were cooled slowly from the liquid phase to form crystals with a large number of defects. We use the cage correlation function [E. Rabani; J. D. Gezelter; and B. J. Berne; J. Chem. Phys. 107 ; 6867 (1997)] which measures changes in atomic surroundings to observe the stretched exponential relaxations. We obtain a distribution of hopping rates assuming that the origin of the Kohlrausch-Williams-Watts law is from static disorder in the distribution of barrier heights. Direct Observation of Stretched-Exponential Relaxation in Low-Temperature Lennard-Jones Systems Using the Cage Correlation Function Eran Rabani Daniel Gezelter BJ Berne doi:10.1103/PhysRevLett.82.3649 Physical Review Letters, Vol. 82, No. 18. (3 May 1999), 3649. 2008-03-24T22:16:42-00:00 Physical Review Letters 82 18 3649 American Physical Society function relaxation review