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Liquid-like behavior of supercritical fluids

Federico Gorelli·Mario Santoro·Tullio Scopigno·Michael Krisch·Giancarlo Ruocco
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Abstract

The high frequency dynamics of fluid oxygen have been investigated by Inelastic X-ray Scattering. In spite of the markedly supercritical conditions ($T\approx 2 T_c$, $P>10^2 P_c$), the sound velocity exceeds the hydrodynamic value of about 20%, a feature which is the fingerprint of liquid-like dynamics. The comparison of the present results with literature data obtained in several fluids allow us to identify the extrapolation of the liquid vapor-coexistence line in the ($P/P_c$, $T/T_c$) plane as the relevant edge between liquid- and gas-like dynamics. More interestingly, this extrapolation is very close to the non metal-metal transition in hot dense fluids, at pressure and temperature values as obtained by shock wave experiments. This result points to the existence of a connection between structural modifications and transport properties in dense fluids.

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Federico Gorelli, Mario Santoro, Tullio Scopigno, Michael Krisch, Giancarlo Ruocco. 2006-11-02. Liquid-like behavior of supercritical fluids. https://doi.org/10.1103/physrevlett.97.245702

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