On the distinguishable cluster approximation for triple excitations.

On the distinguishable cluster approximation for triple excitations.
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关于三重激发的可区分簇近似。

DOI:
10.1063/1.5096343
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发表时间:
2019
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
Andreas Köhn
Andreas Köhn
中科院分区:
--
文献类型:
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作者:
D. Kats;Andreas Köhn

文献摘要

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应用于耦合簇双倍方程的可区分簇近似极大地提高了绝对和相对能量。我们对三元组方程应用相同的近似,并证明它还可以改进单元组、双元组和三元组耦合聚类方法的结果。由此产生的方法在实空间表示中具有 O(N7) 的标称计算尺度,并且对于三个电子而言轨道不变、尺寸广泛且精确。
The distinguishable cluster approximation applied to coupled cluster doubles equations greatly improves absolute and relative energies. We apply the same approximation to the triples equations and demonstrate that it can also improve the results of the coupled cluster method with singles, doubles, and triples. The resulting method has a nominal computational scaling of O(N7) in the real-space representation, and is orbital invariant, size extensive, and exact for three electrons.