Density Functional Prediction of Quasiparticle, Excitation, and Resonance Energies of Molecules With a Global Scaling Correction Approach.

Density Functional Prediction of Quasiparticle, Excitation, and Resonance Energies of Molecules With a Global Scaling Correction Approach.
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使用全局尺度校正方法对分子的准粒子、激发和共振能量进行密度泛函预测。

DOI:
10.3389/fchem.2020.588808
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发表时间:
2020
影响因子:
5.5
通讯作者:
Yang W
Yang W
中科院分区:
化学3区
文献类型:
--
作者:
Yang X;Zheng X;Yang W

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分子准粒子和激发能基本上决定了各种光谱实验中测量的光谱特性。由于通常采用的密度函数近似存在离域误差,基态密度泛函方法对这些能量的准确预测具有相当大的挑战性。在这项工作中,通过假设准粒子能量和广义Kohn-Sham轨道能量之间的定量对应,并采用先前开发的全局标度校正方法,我们实现了分子准粒子和激发能的实质性改进预测。此外,我们还扩展了先前对共振态临时阴离子的研究,这些阴离子与负分子电子亲和有关。该方法不需要对激发态种进行任何明确的自洽场计算,因此具有很高的效率和实用性。
Molecular quasiparticle and excitation energies determine essentially the spectral characteristics measured in various spectroscopic experiments. Accurate prediction of these energies has been rather challenging for ground-state density functional methods, because the commonly adopted density function approximations suffer from delocalization error. In this work, by presuming a quantitative correspondence between the quasiparticle energies and the generalized Kohn–Sham orbital energies, and employing a previously developed global scaling correction approach, we achieve substantially improved prediction of molecular quasiparticle and excitation energies. In addition, we also extend our previous study on temporary anions in resonant states, which are associated with negative molecular electron affinities. The proposed approach does not require any explicit self-consistent field calculation on the excited-state species, and is thus highly efficient and convenient for practical purposes.
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