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arXiv physics/9704020physics.chem-phphysics.bio-phphysics.comp-ph
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极性和带电分子的静电势和溶剂化自由能

Electrostatic potentials and free energies of solvation of polar and charged molecules

Gerhard Hummer, Lawrence R. Pratt, Angel E. Garcia, Bruce J. Berne, Steven W. Rick

摘要:

溶剂化自由能的理论通常涉及溶质电荷位置的静电势。模拟计算,应用截止和周期性的边界条件的基础上,分子中心的结果在中心依赖的静电能的贡献,由于在径向壳的电荷的系统排序。这种电荷的分类在截止球或模拟盒边界处引起表面电荷密度,这取决于分子中心的选择。我们确定了一个简单的解决方案,给出正确的,中心独立的结果,即径向积分的电荷密度。我们的结论说明了在水中的Lennard-Jones溶质。目前的结果可以影响力场的参数化。

英文摘要:

Theories of solvation free energies often involve electrostatic potentials at the position of a solute charge. Simulation calculations that apply cutoffs and periodic boundary conditions based on molecular centers result in center-dependent contributions to electrostatic energies due to a systematic sorting of charges in radial shells. This sorting of charges induces a surface-charge density at the cutoff sphere or simulation-box boundary that depends on the choice of molecular centers. We identify a simple solution that gives correct, center-independent results, namely the radial integration of charge densities. Our conclusions are illustrated for a Lennard-Jones solute in water. The present results can affect the parameterization of force fields.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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