各种QM衍生净原子电荷在多种几何形状中如何重现围绕物质的静电电位?
Alma Carolina Escobosa1, Thomas A Manz1
1Department of Chemical & Materials Engineering, New Mexico State University Las Cruces New Mexico 88003-8001 USA tmanz@nmsu.edu.
RSC advances
|July 8, 2025
概括
我们评估了用于材料模拟的原子电荷分配方法. 新的四极二极再吸收 (QDR) 方法,特别是原子二极管,显著提高了力场中的静电电位的精度.
科学领域:
- 计算化学是一种计算化学.
- 材料科学是一种材料科学.
- 量子化学是一种量子化学.
背景情况:
- 原子中心点电荷模型对于高效的材料古典模拟至关重要.
- 评估各种原子电荷分配方法的性能对于开发精确的力场至关重要.
研究的目的:
- 在各种材料类型中评估各种原子电荷分配方法的性能.
- 引入和验证一种新的计算效率高的四极二极再吸收 (QDR) 方法,用于改进静电建模.
主要方法:
- 对分子系统的12种原子电荷分配方法和对纳米孔状晶体的6种方法进行比较.
- 计算静电电位的根平均平方误差 (RMSE) 和相对RMSE (RRMSE) 与QM计算的电位.
- 评估形状转移性,电荷转移大小,双极/四极时刻复制.
主要成果:
- 新的QDR方法,特别是具有原子二极体的QDR-DDEC6_ad,显著提高了静电电位的精度,优于其他点电荷模型.
- 多ESP方法提供高精度,但需要广泛的训练数据.
- QDR-DDEC6和CM5方法在使用最小的训练数据时显示出良好的形状转移性.
结论:
- 原子中心点电荷加上原子双极为灵活的力场提供了一个有希望的方向.
- 该QDR-DDEC6_ad方法为各种材料的静电建模提供了卓越的精度.
- 电子密度分区方法在高压下显示出对高密度固体的强度.
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