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arXiv 1302.2848physics.chem-ph
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水的分子密度泛函理论

Molecular Density Functional Theory of Water

Guillaume Jeanmairet, Maximilien Levesque, Rodolphe Vuilleumier, Daniel Borgis

摘要:

液态理论的三维实现为复杂环境中水溶液的原子级描述提供了计算机模拟的有效替代方案。在这种情况下,我们提出了一个(经典)分子密度泛函理论(MDFT)的水是来自第一性原理,是基于两个经典的密度场,标量的,粒子密度,和矢量的,多极极化密度。它的实施需要作为输入的部分电荷分布的水分子和三个可测量的体属性,即结构因子和k依赖的纵向和横向介电常数。它必须由溶质-溶剂三体项来补充,以在短距离内加强四面体有序。示出的方法,以提供正确的三维微观溶剂化配置文件周围的各种分子溶质,可能拥有H-键合位点,在计算机成本两个-三个数量级低于显式模拟。

英文摘要:

Three dimensional implementations of liquid state theories offer an efficient alternative to computer simulations for the atomic-level description of aqueous solutions in complex environments. In this context, we present a (classical) molecular density functional theory (MDFT) of water that is derived from first principles and is based on two classical density fields, a scalar one, the particle density, and a vectorial one, the multipolar polarization density. Its implementation requires as input the partial charge distribution of a water molecule and three measurable bulk properties, namely the structure factor and the k-dependent longitudinal and transverse dielectric constants. It has to be complemented by a solute-solvent three-body term that reinforces tetrahedral order at short range. The approach is shown to provide the correct three-dimensional microscopic solvation profile around various molecular solutes, possibly possessing H-bonding sites, at a computer cost two-three orders of magnitude lower than with explicit simulations.

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