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A New Approach to Reactive Potentials with Fluctuating Charges: Quadratic Valence-Bond Model

机译:带有波动电荷的反应电势的新方法:二次价键模型

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Chemical potential equilibration models have proven to be a promising approach for describing charge transfer and polarization in the context of classical force fields. These have generally been justified in an ad hoc manner and are known to behave incorrectly in certain cases, presenting a stumbling block to widespread application. In this paper, we present a new wave function-based derivation of a CPE-like model, shedding some light on the nature of the approximations that are made. The concept of a pairwise hardness arises naturally from this derivation, leading us to suggest a model that employs a pairwise electronegativity. We show that this leads to a CPE-like model that dissociates correctly for a diatomic and furthermore predicts charges in agreement with ab initio methods for a simple diatomic.
机译:化学势平衡模型已被证明是描述经典力场背景下电荷转移和极化的一种有前途的方法。这些通常以临时的方式被证明是合理的,并且在某些情况下已知行为不正确,这为广泛应用提供了绊脚石。在本文中,我们提出了一种基于波动函数的新型CPE模型推导方法,它为所近似的性质提供了一些启示。成对硬度的概念自然源于此推导,使我们提出了采用成对电负性的模型。我们表明,这导致了一个CPE样的模型,该模型正确地解离了双原子,并且进一步预测了与简单的双原子从头算方法相一致的电荷。

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