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arXiv 2012.10488physics.chem-ph
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激发态平均场计算的可靠跃迁性质

Reliable transition properties from excited-state mean-field calculations

Susannah Bourne Worster, Oliver Feighan, Frederick R. Manby

摘要:

δ自洽场论是一种概念简单、计算量小的寻找激发态的方法。使用最大重叠方法来指导激发态的优化,已被证明delta-SCF预测激发能的准确度是有竞争力的,有时甚至比,TDDFT。在这里,我们基准的一组更大的分子比以前被认为是三角洲-SCF,特别是,我们检查的性能的三角洲-SCF在预测跃迁偶极矩,光谱强度的基本数量。一个潜在的下降的delta-SCF跃迁偶极子是由delta-SCF基态和激发态的非正交性引起的原点依赖。我们提出并测试这个问题的最简单的校正,对称正交化的状态的基础上,并证明其使用细菌叶绿素结构的光合作用天线在紫色细菌采样。

英文摘要:

Delta-self-consistent field theory (delta-SCF) is a conceptually simple and computationally inexpensive method for finding excited states. Using the maximum overlap method to guide optimization of the excited state, delta-SCF has been shown to predict excitation energies with a level of accuracy that is competitive with, and sometimes better than, that of TDDFT. Here we benchmark delta-SCF on a larger set of molecules than has previously been considered, and, in particular, we examine the performance of delta-SCF in predicting transition dipole moments, the essential quantity for spectral intensities. A potential downfall for delta-SCF transition dipoles is origin dependence induced by the nonorthogonality of delta-SCF ground and excited states. We propose and test the simplest correction for this problem, based on symmetric orthogonalization of the states, and demonstrate its use on bacteriochlorophyll structures sampled from the photosynthetic antenna in purple bacteria.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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