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Phys Rev Lett. 2000 Oct 9;85(15):3245-8.

Hydrogen bonding and dipole moment of water at supercritical conditions: a first-principles molecular dynamics study.

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1
Joint Research Center for Atom Technology, Angstrom Technology Partnership (JRCAT-ATP), 1-1-4 Higashi, Tsukuba-shi, Ibaraki 305-0046, Japan.

Abstract

We present a first-principles molecular dynamics study of water near and above the critical point ( T = 647 K, rho = 0.32 g/cm(3)). We find that the systems undergo fast dynamics with continuous formation and breaking of H bonds. At low density, the system fragments mostly into trimers, dimers, and single molecules. At a higher density, more complex structures appear and an extended, albeit very dynamical, H-bond network can be identified. These structures have important consequences for the screening properties of the system. This offers a clue to understanding the peculiar chemical behavior of a supercritical system and allows thermodynamical tuning of its solvent properties.

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