Hard sphere-like dynamics in a non hard sphere liquid
arXiv:cond-mat/0503140 · doi:10.1103/PhysRevLett.94.155301
Abstract
The collective dynamics of liquid Gallium close to the melting point has been studied using Inelastic X-ray Scattering to probe lengthscales smaller than the size of the first coordination shell. %(momentum transfers, , 15 nm). Although the structural properties of this partially covalent liquid strongly deviate from a simple hard-sphere model, the dynamics, as reflected in the quasi-elastic scattering, are beautifully described within the framework of the extended heat mode approximation of Enskog's kinetic theory, analytically derived for a hard spheres system. The present work demonstrates the applicability of Enskog's theory to non hard- sphere and non simple liquids.
5 pages, 2 figures, accepted in Phys. Rev. Lett
References in corpus (2)
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