Influence of mass difference on dynamic properties of isotope mixtures

Details Influence of mass difference on dynamic properties of isotope mixtures Influence of mass difference on dynamic properties of isotope mixtures

2003-11-12

arxiv.org/abs/cond-mat/0311290v1

Physics

Condensed Matter

7 pages, 1 table, 11 figures

Scientific paper

We present the results of a Molecular Dynamics computer simulations of a two component isotope mixture of Lennard-Jones particles, monodisperse in size but different in masses, at a fixed average density and temperature. We study changes in properties that result from mass heterogeneity, by measuring the pair distribution function, diffusion coefficient, velocity autocorrelation function, non-Gaussian and isotope effect parameters, as functions of the degree of mass difference. Our results show that if static properties are not influenced by a variation of mass variation, the dynamic properties are significantly affected and even exhibit the presence of ``critical'' values in the mass difference. We also demonstrate that our model gives a simple contra example to a recently proposed a universal scaling law for atomic diffusion in condensed matter [M. Dzugudov, Nature, v.381, 137 (1996)].

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