距离分离的长距离SOPPA短距离密度函数理论方法对垂直激发能量的性能
Juliane H Fuglsbjerg1, Dániel Nagy1, Hans Jørgen Aa Jensen2
1Department of Chemistry, University of Copenhagen, Copenhagen Ø, Denmark.
The Journal of chemical physics
|May 22, 2024
概括
这项研究对有机分子的垂直电子激发能进行了基准测试. 在单元状态下,SOPPA-srPBE方法通常优于PBE和SOPPA,在计算化学中提供了更高的准确性.
科学领域:
- 计算化学计算化学
- 量子化学 是一个量子化学.
- 理论化学 理论化学
背景情况:
- 准确计算垂直电子激发能量对于理解分子特性和光谱至关重要.
- 像密度函数理论 (DFT) 和二次极化传播器近似 (SOPPA) 这样的现有方法在描述远程电子相关性方面存在局限性.
- 将短距离的DFT与长距离的SOPPA相结合,提供了一个潜在的改善.
研究的目的:
- 为了对混合远程SOPPA和短程PBE (SOPPA-srPBE) 方法用于计算垂直电子激发能量的性能进行基准测试.
- 为了评估SOPPA-srPBE的准确性,与有机分子中单元和三元状态的参考CC3方法进行比较.
- 为了比较SOPPA-srPBE与独立PBE和SOPPA的性能.
主要方法:
- 应用SOPPA-srPBE方法来计算垂直电子激发能.
- 在28个中型有机分子中调查了132个单元和71个三元状态.
- 结果与CC3方法获得的参考值进行比较.
主要成果:
- 该SOPPA-srPBE方法始终超过单独的PBE功能.
- 与SOPPA相比,SOPPA-srPBE在单片激发能量方面表现优越.
- 与CC3参考值相比,SOPPA-srPBE在三倍激发能量的准确性略低于SOPPA.
结论:
- SOPPA-srPBE方法为计算有机系统中垂直电子激发能提供了有价值和准确的方法.
- 这种混合方法在精度和计算成本之间提供了有希望的平衡,特别是在单个状态下.
- 对三重状态的进一步调查可能是有必要的,以完全优化该方法在不同的旋转倍数上的性能.
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