A Generalized-Yvon−Born−Green Theory for Determining Coarse-Grained Interaction Potentials†
A Generalized-Yvon−Born−Green Theory for Determining Coarse-Grained Interaction Potentials†
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DOI：
10.1021/jp9073976
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发表时间：
2010-04
影响因子：
3.7
通讯作者：
J. W. Mullinax;W. Noid
中科院分区：
文献类型：
--
作者：
J. W. Mullinax;W. Noid
The present work introduces a generalized-Yvon−Born−Green (YBG) theory for calculating coarse-grained (CG) force fields directly from structure ensembles. The method is noniterative and determines the CG potentials from a system of coupled linear integral equations that are expressed in terms of structural correlation functions for the CG sites. The force field obtained by solving these linear equations provides a variationally optimal approximation to the many-body potential of mean force determined by the atomistic model and the CG mapping. The generalized-YBG theory is equivalent to the conventional YBG equation when applied to monatomic liquids but also correctly treats the many-body structural correlations present in more complex molecular systems. Additionally, this work introduces an analogous version of the theory for determining discrete force field parameters. Numerical calculations for a CG model of a propane−propanol mixture illustrate the method.
