arXiv 1402.26972014-02-11physics.chem-phcond-mat.mtrl-sci

The Combined Influence of Nuclear Quantum Effects and van der Waals Interactions on the Structure of Ambient Water

Jeffrey M. McMahon, Miguel A. Morales, Brian Kolb, Timo Thonhauser

英文摘要：

Path-integral molecular dynamics simulations based on density functional theory employing exchange-correlation density functionals capable of treating nonlocal van der Waals (vdW) interactions self-consistently provide a remarkably accurate description of ambient water. Moreover, they suggest that water's structure may be impacted by a combined influence between nuclear quantum effects and vdW interactions. The latter strongly favor the formation of a high-density liquid, whereas the inclusion of the former mitigates this by decreasing the mean hydrogen-bond (H-bond) distance. Examining the structure of water reveals that while the major fraction of molecules do in fact exhibit the traditional picture of near-tetrahedral coordination, the liquid considerably softer than previously simulations have suggested, including a much lower proportion of molecules double-donating H-bonds as well as a much larger distribution of their angles.

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