Umbrella integration with higher-order correction terms.

Umbrella integration with higher-order correction terms.
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与高阶校正项的伞式集成。

DOI:
10.1063/1.4729373
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发表时间:
2012
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
J. Kästner
J. Kästner
中科院分区:
--
文献类型:
--
作者:
J. Kästner

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伞型积分是分析伞型抽样模拟的一种方法。它从分子动力学获得的分布计算自由能变化。虽然它可以在全采样分布上公式化,但它们通常近似于正态分布。这等价于截断二次项后相对于反应坐标的自由能的幂级数或截断累积展开。在这里,推导出幂级数中附加项的表达式。它们可以从分布的中心矩计算出来。这个扩展允许在应用程序中测试近似。
Umbrella integration is a method to analyze umbrella sampling simulations. It calculates free-energy changes from distributions obtained from molecular dynamics. While it can be formulated on the full sampled distributions, they are generally approximated by normal distributions. This is equivalent to the truncation of a power series of the free energy with respect to the reaction coordinate after the quadratic term or by a truncation of a cumulant expansion. Here, expressions for additional terms in the power series are derived. They can be calculated from the central moments of the distributions. This extension allows to test the approximations in applications.
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