UTDA-xDH:通过XYG3型双混合密度函数在不受限制的Tamm-Dancoff近似中精确的双倍激发能量
Qinjie Yang1, Xin Xu1,2
1Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), Shanghai Key Laboratory of Molecular Catalysis and Innovation Materials, MOE Laboratory for Computational Physical Science, Research Center for Chemical Theory, Department of Chemistry, Fudan University, Shanghai 200438, China.
我们介绍UTDA-xDH,一种用于激发状态计算的新计算方法. 这种方法准确地预测了激素的激发能量,优于传统方法和竞争先进技术.
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:
- 精确预测激发状态属性在化学中至关重要.
- 传统的密度函数理论 (DFT) 方法经常在激发状态的准确性方面扎,特别是在激进状态中.
- 双混合密度函数 (xDH) 提供了更好的性能,但需要仔细实施激发状态计算.
研究的目的:
- 开发和评估UTDA-xDH方法用于计算激发状态能量的性能.
- 在UTDA框架内评估三个特定的xDH函数 (XYG3,XYGJ-OS,xDH-PBE0) 的准确性和稳定性.
- 为了比较UTDA-xDH与传统的DFT和高层次的ab initio方法 (如EOM-CCSD) 的性能.
主要方法:
- 开发UTDA-xDH方法,将XYG3型双杂交函数与不受限制的塔姆-丹科夫近似相结合.
- 评估三种xDH函数 (XYG3,XYGJ-OS,xDH-PBE0) 使用一组数据集,用于小基的双倍激发能量.
- 在评估的方法中对旋转污染的评估.
主要成果:
- 这三种UTDA-xDH方法都在价值和Rydberg激发方面表现出卓越的准确性和稳定性.
- 平均绝对偏差 (MADs) 在0.07到0.13 eV之间,优于传统的DFT方法.
- 与非xDH对应物相比,UTDA-xDH方法显著减少了旋转污染,使得对具有挑战性的系统可以进行准确的预测.
结论:
- UTDA-xDH方法为激发状态计算提供了一个高度准确和高效的方法.
- 这种方法广泛适用于开放和封闭系统,包括具有挑战性的激进物种.
- UTDA-xDH为激发状态物业预测提供了EOM-CCSD的竞争性替代方案.
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