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Multilevel extension of the cluster-in-molecule local correlation methodology: Merging coupled-cluster and m?ller-plesset perturbation theories

机译:分子中簇局部相关方法的多级扩展:合并耦合簇和miller-plesset摄动理论

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摘要

A multilevel extension of the local correlation "cluster-in- molecule" (CIM) framework, which enables one to combine different quantum chemistry methods to treat different regions in a large molecular system without splitting it into ad hoc fragments and saturating dangling bonds, is proposed. The resulting schemes combine higher-level methods, such as the completely renormalized coupled-cluster (CC) approach with singles, doubles, and noniterative triples, termed CR-CC(2,3), to treat the reactive part of a large molecular system, and lower-order methods, such as the second-order M?ller-Plesset perturbation theory (MP2), to handle the chemically inactive regions. The multilevel CIM-CC/MP2 approaches preserve the key features of all CIM methods, such as the use of orthonormal localized orbitals and coarse-grain parallelism, while substantially reducing the already relatively low costs of the single-level CIM-CC calculations. Illustrative calculations include bond breaking in dodecane and the reactions of the bis(2,4,4- trimethylpentyl)dithiophosphinic acid with one and two water molecules.
机译:局部相关“分子内簇”(CIM)框架的多级扩展,它使人们能够结合使用不同的量子化学方法来处理大分子系统中的不同区域,而不必将其拆分为临时片段并饱和悬空键。建议。生成的方案结合了更高级别的方法,例如带有单,双和非迭代三元组的完全重归一化的耦合集群(CC)方法,称为CR-CC(2,3),用于处理大分子系统的反应部分,以及低阶方法(例如二阶M?ller-Plesset微扰理论(MP2))来处理化学惰性区域。多级CIM-CC / MP2方法保留了所有CIM方法的关键功能,例如使用正交局部轨道和粗粒度并行性,同时大大降低了单级CIM-CC计算的成本。说明性的计算包括十二烷中的键断裂以及双(2,4,4-三甲基戊基)二硫代次膦酸与一个和两个水分子的反应。

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