长距离纠正密度函数理论,包括一个双高斯哈特树叉运算符,用于高精度的核心激发能量计算第二和第三排原子 (LC2gau-core-BOP)
Dae-Hwan Ahn1, Takahito Nakajima2, Kimihiko Hirao2,3
1Department of Chemistry Education, Daegu University, Gyeongsan-si 113-8656, Korea.
Journal of chemical theory and computation
|August 6, 2024
概括
新的LC2gau-core-BOP方法准确地计算了第二排和第三排原子的核心激发能. 这种改进的Hartree-Fock (HF) 交换模型提高了各种分子系统的性能.
科学领域:
- 计算化学的计算化学
- 量子化学 是一个量子化学.
- 理论化学 理论化学
背景情况:
- 之前的LCgau-core-BOP方法准确计算了第二排原子的核心激发能,但低估了第三排原子的能量.
- 核心激发能量对于理解电子结构和化学反应性至关重要.
研究的目的:
- 开发一种改进的计算方法,在周期表的不同行中进行准确的核心激发能计算.
- 调查短距离Hartree-Fock (HF) 交换对核心激发能量的计算的影响.
主要方法:
- 在LCgau-core-BOP方法中引入一个额外的加索减弱的HF交换术语,创建LC2gau-core-BOP.
- 用LC2gau-core-BOP方法对含有第二和第三排原子的中小分子进行系统测试.
- 在OP相关函数中对一个参数的优化,用于原子化能量计算.
主要成果:
- LC2gau-core-BOP实现了第二排原子的平均绝对误差 (MAE) 为0.6 eV,第三排原子的平均误差为0.3 eV.
- 该方法表明,对于中型分子,与实验值的偏差小于0.8 eV.
- 优化的LC2gau-core-BOP显示了与B3LYP.比较的原子化能量精度.
结论:
- LC2gau-core-BOP显著提高了核心激发能量计算的准确性,特别是在第三排原子.
- 灵活包含短距离高频交换是提高不同原子行性能的关键.
- 该方法对核心激发和原子化能量的准确计算具有前景.
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