对于双态亚亚巴特形交叉点的局部糖尿病化方法
Eva Vandaele1, Momir Mališ1, Sandra Luber1
1Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
Journal of chemical theory and computation
|January 4, 2024
概括
本研究引入了一种使用电子结构计算分析形交叉点 (CI) 的新方法. 该方法可以计算没有波函数的非adiabatic合向量,这对于理解分子动力学至关重要.
科学领域:
- 量子化学 是一个量子化学.
- 理论化学 理论化学
- 计算化学的计算化学
背景情况:
- 圆交点 (CIs) 是分子电子结构中的关键点,在这些点上,亚亚巴特状态变得退化.
- 描述CI对于理解非adiabatic过程至关重要,例如内部转化和光化学反应.
- 目前用于计算非adiabatic合 (NAC) 矢量的现有方法通常需要波函数,从而限制了它们的适用性.
研究的目的:
- 开发一种新的,无波函数的方法论,用于形交叉点的局部表征.
- 为了能够计算基于CI的能量梯度和Hessian的非adiabatic合向量.
- 证明新方法在各种分子系统和计算层面上的广泛适用性.
主要方法:
- 该方法识别了从海森和梯度在CI的分支空间坐标.
- 在CI附近的潜在能量表面以糖尿病表示表示.
- 非adiabatic合向量是使用基于能量,无波函数的方法计算的.
主要成果:
- 该方法已成功地被应用到调查使用SA-CASSCF和XMS-CASPT2.2.在formamide (S1-S2) 中的最小能量CI (MECI).
- 使用SA-CASSCF分析了环氨 (S0-S1) 中不对称的MECI.
- 使用SA-CASSCF,TDDFT和XMS-CASPT2研究了 (S1-S2) 和硫 (S1-S2) 中的CI,展示了该方法的多功能性.
结论:
- 开发的方法提供了一个强大的和多功能工具,用于表征形交叉点.
- 这种无波函数的方法简化了NAC向量的计算,扩大了它们在理论化学中的可访问性.
- 对多种系统的成功应用突显了该方法在推进非adiabatic分子动力学研究方面的潜力.
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