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A systematic study of water models for molecular simulation: Derivation of water models optimized for use with a reaction field

机译:用于分子模拟的水模型的系统研究:优化用于反应场的水模型的推导

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We have performed long molecular dynamics simulations of water using four popular water models, namely simple point charge (SPC), extended simple point charge (SPC/E), and the three point (TIP3P) and four point (TIP3P) transferable intermolecular potentials. System sizes of 216 and 820 molecules were used to study the dependence of properties on the system size. All systems were simulated at 300 K with and without reaction fields and with two different cutoff radii, in order to study the impact of the cutoff treatment on density, energy, dynamic, and dielectric properties. Furthermore we generated two special-purpose water models based on the SPC and TIP4P models, for use with a reaction field. The atomic charges and the Lennard-Jones C-12 parameter were optimized to reproduce the correct energy and pressure using the weak coupling algorithm for parameters. Indeed, in simulations without parameter coupling of both new models the density and potential energy were found to be close to the experimental values. The other properties of these models that we called SPC/RF and TIP4P/RF (where RF stands for reaction field) rue evaluated and discussed. (C) 1998 American Institute of Physics. [References: 81]
机译:我们使用四种流行的水模型,即简单点电荷(SPC),扩展简单点电荷(SPC / E)以及三点(TIP3P)和四点(TIP3P)可转移的分子间电势,对水进行了长分子动力学模拟。使用216和820分子的系统大小来研究属性对系统大小的依赖性。为了研究截止处理对密度,能量,动态和介电性能的影响,所有系统都在300 K下模拟了有无反应场以及有两个不同的截止半径。此外,我们基于SPC和TIP4P模型生成了两个特殊用途的水模型,用于反应场。使用参数的弱耦合算法,优化了原子电荷和Lennard-Jones C-12参数以重现正确的能量和压力。实际上,在没有新模型都进行参数耦合的模拟中,发现密度和势能接近实验值。评估和讨论了这些模型的其他属性,我们称之为SPC / RF和TIP4P / RF(其中RF代表反应场)。 (C)1998美国物理研究所。 [参考:81]

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