Active space approaches combining coupled-cluster and perturbation theory for ground states and excited states

Active space approaches combining coupled-cluster and perturbation theory for ground states and excited states
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结合耦合团簇和基态和激发态微扰理论的主动空间方法

DOI:
10.1080/00268976.2020.1808726
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发表时间:
2020
期刊:
影响因子:
1.7
通讯作者:
Berkelbach, Timothy C.
Berkelbach, Timothy C.
中科院分区:
化学4区
文献类型:
--
作者:
Lange, Malte F.;Berkelbach, Timothy C.

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我们评估的方法,结合联合收割机耦合集群和微扰理论的基础上预定义的活性空间的轨道的性能。耦合集群理论用于治疗内部的活动空间和微扰理论是用于所有其他的激发,这是至少部分外部的活动空间。我们考虑了各种不同的计划,在如何内部和外部激励耦合。这种方法的基态和激发态内的运动方程的形式主义。结果给出的电离电位和电子亲合势的一组测试的小分子和相关能量和带隙的几个周期性固体。
We evaluate the performance of approaches that combine coupled-cluster and perturbation theory based on a predefined active space of orbitals. Coupled-cluster theory is used to treat excitations that are internal to the active space and perturbation theory is used for all other excitations, which are at least partially external to the active space. We consider a variety of schemes that differ in how the internal and external excitations are coupled. Such approaches are presented for ground states and excited states within the equation-of-motion formalism. Results are given for the ionisation potentials and electron affinities of a test set of small molecules and for the correlation energy and band gap of a few periodic solids.
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