一种基于约束的轨道优化激发状态方法 (COOX)
Jörg Kussmann1, Yannick Lemke1, Anthea Weinbrenner1
1Chair of Theoretical Chemistry, Department of Chemistry, Ludwig-Maximilians-Universität in Munich (LMU), München D-81377, Germany.
Journal of chemical theory and computation
|September 30, 2024
概括
我们开发了一种新的计算方法,COOX,用于准确计算电子激发状态. 这种方法提供了稳定的收和精确的激发状态密度,改进了量子化学模拟.
科学领域:
- 量子化学 是一个量子化学.
- 计算光谱学是一种计算光谱学.
- 电子结构理论 电子结构理论
背景情况:
- 精确计算电子激发状态对于理解光物理和光化学过程至关重要.
- 传统的方法,如线性响应时间依赖密度函数理论 (LR-TDDFT),对于某些系统而言,可能面临着对度和精度的挑战.
- 约束密度函数理论 (cDFT) 提供了一个框架,用于在电子结构计算过程中强制执行特定属性.
研究的目的:
- 介绍一种新的方法,即基于约束的轨道优化兴奋状态 (COOX) 方法,用于直接计算目标电子兴奋状态.
- 为现有方法提供稳定和准确的替代方案,用于在自相一致场 (SCF) 框架内计算激发状态.
- 为了使后SCF电子相关联方法的应用到激发状态.
主要方法:
- 从简化的LR-TDDFT计算中开发基于差异密度的新约束.
- 在自一致场 (SCF) 计算中实施COOX方法.
- 使用受限制的SCF方法用于单片激发,以防止旋转污染,并允许SCF后处理.
主要成果:
- COOX 方法证明了激发状态计算的稳定收行为.
- 实现了符合 Aufbau 原则的精确激发状态密度.
- 证明了对各种系统的适用性,包括激发能量的基准,激发状态核力,结构优化,远程电荷转移激发和圆交叉点.
结论:
- COOX 方法为计算电子激发状态提供了强大而准确的方法.
- 该方法能够产生准确的密度,并促进SCF后的治疗,这为理论研究开辟了新的途径.
- 在研究诸如电荷转移和形交叉等复杂现象方面,COOX显得有前途.
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