相互作用潜力的范围分离在分子间和分子内对称性适应扰动理论中的相互作用潜力
Du Luu1, Clemence Corminboeuf2, Konrad Patkowski1
1Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States.
Journal of chemical theory and computation
|September 10, 2024
概括
分离范围对称适应扰动理论 (SAPT) 提供了一种分析分子相互作用的新方法. 这种方法准确地近似非共价能,甚至捕捉了通常被其他技术遗漏的短距离效应.
科学领域:
- 计算化学是一种计算化学.
- 量子化学是一种量子化学.
- 分子相互作用分子相互作用.
背景情况:
- 适应对称性扰动理论 (SAPT) 被广泛用于计算非共价相互作用.
- 内分子SAPT (ISAPT) 将此扩展到单个分子内的相互作用.
- 目前的方法难以准确地同时捕捉远程和短程相互作用效应.
研究的目的:
- 探索SAPT和ISAPT的新型范围分离方法.
- 用高斯函数和误差函数研究库伦电位分裂的有效性.
- 仅使用远程贡献来评估近似相互作用能量的准确性.
主要方法:
- 应用范围分离到库伦电位 (1/r) 的长距离和短距离组件.
- 利用高斯函数和错误函数对潜在的划分.
- 在各种分子间和分子内复合体上测试了该方法.
- 将区间分离的SAPT/ISAPT结果与完整的SAPT/ISAPT计算进行比较.
主要成果:
- 分隔范围的SAPT和ISAPT能量校正显示与完整的SAPT/ISAPT数据相符.
- 长距离相互作用潜力,当范围分离时,提供了对短距离术语的有用解释.
- 这与多极扩张在捕捉电荷透和交换效应方面的局限性形成鲜明对比.
- 通过对所有相互作用项应用错误函数分离,可以实现最佳一致性.
结论:
- 区间分离的SAPT/ISAPT是分析非共价相互作用的可行替代方案.
- 这种方法有效地结合了关键的短期影响.
- 它代表了分子内无约束能量的无碎片化分解的一步.
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