Multireference Density Functional Theory for Describing Ground and Excited States with Renormalized Singles.

Multireference Density Functional Theory for Describing Ground and Excited States with Renormalized Singles.
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DOI:
10.1021/acs.jpclett.1c03913
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发表时间:
2022-01-27
影响因子:
5.7
通讯作者:
Yang, Weitao
Yang, Weitao
中科院分区:
化学2区
文献类型:
--
作者:
Li, Jiachen;Chen, Zehua;Yang, Weitao

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我们应用重正化单重态(RS)的多参考密度泛函理论(DFT)计算的基态和激发态的准确能量。多参考密度泛函方法将N电子系统的总能量确定为密度泛函近似(DFA)的(N − 2)电子能量和粒子-粒子Tamm-Dancoff近似(ppTDA)的双电子加成能量之和,自然包括多参考描述。ppTDA@RS-DFA方法在计算双电子加成能时,采用了捕获所有单电子贡献的RS哈密顿量,并采用优化有效势方法对其总能量进行了优化。它显著改进了原始ppTDA@DFA。对于基态,ppTDA@RS-DFA适当地描述了测试的解离曲线和乙烯的双键旋转。对于激发态,ppTDA@RS-DFA提供准确的激发能,并在很大程度上消除了DFA的依赖性。因此,ppTDA@RS-DFA为具有静态相关性的系统提供了有效的多参考方法。
We applied renormalized singles (RS) in the multireference density functional theory (DFT) to calculate accurate energies of ground and excited states. The multireference DFT approach determines the total energy of the N-electron system as the sum of the (N − 2)-electron energy from a density functional approximation (DFA) and the two-electron addition energies from the particle–particle Tamm–Dancoff approximation (ppTDA), naturally including multireference description. The ppTDA@RS-DFA approach uses the RS Hamiltonian capturing all singles contributions in calculating two-electron addition energies, and its total energy is optimized with the optimized effective potential method. It significantly improves the original ppTDA@DFA. For ground states, ppTDA@RS-DFA properly describes dissociation curves tested and the double bond rotation of ethylene. For excited states, ppTDA@RS-DFA provides accurate excitation energies and largely eliminates the DFA dependence. ppTDA@RS-DFA thus provides an efficient multireference approach to systems with static correlation.
入门讲座:当非相互作用参考系统的密度不是密度功能理论中物理系统的密度时。
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