基于非对等的局部化分子轨道的配置相互作用的电子刺激能量计算
Feng Long Gu1, Daoling Peng1, Liang Peng1
1Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; School of Environment, South China Normal University, Guangzhou 510006, P. R. China.
Journal of chemical theory and computation
|November 20, 2025
概括
这项研究引入了一种新的计算方法,将配置交互 (CI) 与非直角局部分子轨道 (NOLMOs) 结合起来,用于激发状态计算. 这种NOLMO-CI方法提供了一种更有效,更准确的方法来研究分子中的电子激发状态.
科学领域:
- 量子化学 是一个量子化学.
- 计算化学的计算化学
- 理论化学 理论化学
背景情况:
- 传统的配置相互作用 (CI) 方法依赖于规范的哈特里-福克分子轨道.
- 与单个激发状态 (CIS) 的配置相互作用是激发状态计算的常用方法.
- 非对角局部化分子轨道 (NOLMOs) 已被开发用于高效的电子结构计算.
研究的目的:
- 开发和探索一种新的方法,将CI与NOLMOs结合起来,用于电子激发状态计算.
- 为了研究这种新方法的性能,称为NOLMO-CIS,与现有的方法相比.
- 评估NOLMOs在大型系统中进行相关电子结构计算的潜力.
主要方法:
- 开发了一种基于非直角局部分子轨道 (NOLMOs) 的配置相互作用 (CI) 方法.
- 通过使用虚拟NOLMO替换被占用的NOLMO生成激发状态配置,通过变量计算确定.
- 采用状态平均方法来最大限度地减少地面和兴奋状态能量,同时保持波函数直角.
主要成果:
- 在NOLMO-CIS中激发的决定因素的数量等于电子的数量 (N),独立于基础函数.
- NOLMO-CIS捕获了用于基态计算的显著电子相关性,但其尺寸不一致.
- 对于小分子的兴奋状态计算,NOLMO-CIS在传统的CIS和时间依赖的DFT上表现出优异的性能.
结论:
- 将CI与NOLMO (NOLMO-CIS) 结合在一起,为电子兴奋状态计算提供了一个有前途的进步.
- 与CIS和TD-DFT等传统方法相比,这种方法提供了更好的准确性和效率.
- 基于NOLMO的相关电子结构计算是大分子系统高效计算方法的重要一步.
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