Strong pressure-energy correlations in van der Waals liquids

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Abstract

Strong correlations between equilibrium fluctuations of the configurational parts of pressure and energy
are found in computer simulations of the Lennard-Jones liquid and other simple liquids, but not for
hydrogen-bonding liquids such as methanol and water. The correlations that are present also in the crystal
and glass phases reflect an effective inverse power-law repulsive potential dominating fluctuations, even at
zero and slightly negative pressure. In experimental data for supercritical argon, the correlations are found
to be approximately 96%. Consequences for viscous liquid dynamics are discussed.
OriginalsprogEngelsk
TidsskriftPhysical Review Letters
Vol/bind100
Udgave nummer1
Antal sider4
ISSN0031-9007
DOI
StatusUdgivet - 2008

Bibliografisk note

Paper id:: 015701

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