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Hard sphere-like dynamics in a non hard sphere liquid

T. Scopigno·R. Di Leonardo·L. Comez·A. Q. R. Baron·D. Fioretto·G. Ruocco
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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, $Q$, $>$15 nm$^{-1}$). 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.

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T. Scopigno, R. Di Leonardo, L. Comez, A. Q. R. Baron, D. Fioretto, G. Ruocco. 2005-03-07. Hard sphere-like dynamics in a non hard sphere liquid. https://doi.org/10.1103/physrevlett.94.155301

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