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首页> 外文期刊>The Journal of Chemical Physics >A well-behaved theoretical framework for ReaxFF reactive force fields
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A well-behaved theoretical framework for ReaxFF reactive force fields

机译:Reaxff反应力领域的一个乖巧的理论框架

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In recent work, we have presented a new ReaxFF formulation with a superior conservation of energy in reactive molecular dynamics simulations. The key ingredient in the approach involved the tapering of bond order and bond distance discontinuities using Hermite polynomials. This Communication extends the previous formulation by alleviating additional sources of numerical instability in the original formalism. These "numerical pathologies" are rooted in the counting of lone-pair electrons, the sum of bond orders between atoms that form a valence angle, and the definition of a torsional potential. Based on a theoretical analysis, new functions that mitigate these limitations are designed and validated. The extent of their transferability with previous parameterizations is discussed. The new enhancements provide further gains in numerical stability to facilitate exploration of reactive energy landscapes.
机译:在最近的工作中,我们提出了一种新的Reaxff配方,其具有优越地保护能量分子动力学模拟中的能量。 方法中的关键成分涉及使用Hermite多项式的键合序命令和键距离不连续性。 该通信通过减轻原始形式主义中的额外数值不稳定性来扩展先前的制剂。 这些“数值病理”根植于单位的单位电子计数,其在形成价角的原子之间的键序的总和,以及扭转电位的定义。 基于理论分析,设计和验证了减轻这些限制的新功能。 讨论了与先前参数化的可转换性的程度。 新增强功能在数值稳定性方面提供了进一步的增益,以促进反应能量景观的探索。

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