Improved and simplified orthogonalisation scheme and connected triples correction within the internally contracted multireference coupled-cluster method

Improved and simplified orthogonalisation scheme and connected triples correction within the internally contracted multireference coupled-cluster method
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内部契约多参考耦合聚类方法中改进和简化的正交化方案和连接三元组校正

DOI:
10.1080/00268976.2020.1743889
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发表时间:
2020
期刊:
影响因子:
1.7
通讯作者:
M. Hanauer
M. Hanauer
中科院分区:
化学4区
文献类型:
--
作者:
A. Köhn;J. A. Black;Y. A. Aoto;M. Hanauer

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内部承包多参考耦合集群理论(icMRCC)的审查,提供额外的见解,我们已经获得了近年来。此外,提出了几个修改,导致在该方法的整体改进。这些包括一个更简单的和规模广泛的方式来产生的激励歧管,因此确定集群的振幅。修正和近似也被引入到微扰三重校正,icMRCCSD(T),这导致了一个小的改进,在以前的表现,在减少的计算成本。通过这些重新制定的方法,我们可以接近亚化学准确度结果。
The internally contracted multireference coupled-cluster theory (icMRCC) is reviewed, providing additional insights that we have gained over recent years. In addition, several modifications are presented that lead to an overall improvement in the method. These include a simpler and size extensive way to generate the excitation manifold and therefore determine the cluster amplitudes. Modifications and approximations are also introduced to the perturbative triples correction, icMRCCSD(T), which lead to a small improvement over the previous manifestation, at a reduced computational cost. With these reformulated methods, we can approach sub-chemical accuracy results.
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DOI: --
发表时间: 1998
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发表时间: 1977
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