Hard-sphere-like dynamics in a non-hard-sphere liquid.
The collective dynamics of liquid gallium close to the melting point has been studied using inelastic x-ray scattering to probe length scales smaller than the size of the first coordination shell. Although the structural properties of this partially covalent liquid strongly deviate from a simple hard-sphere model, the dynamics, as reflected in the quasielastic scattering, are beautifully described within the framework of the extended heat mode approximation of Enskog's kinetic theory, analytically derived for a hard-sphere system. The present work demonstrates, therefore, the applicability of Enskog's theory beyond simple liquids.
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INFM CRS-SOFT, c/o Universitá di Roma LaSapienza, I-00185, Roma, Italy.
Di Leonardo
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Baron
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Fioretto
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Ruocco
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