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Coupled-cluster method tailored by configuration interaction

机译:通过配置交互量身定制的耦合集群方法

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A method is presented which combines coupled cluster (CC) and configuration interaction (CI) to describe accurately potential-energy surfaces (PESs).We use the cluster amplitudes extracted from the complete active space CI calculation to manipulate nondynamic correlation to tailor a single reference CC theory (TCC).The dynamic correlation is then incorporated through the framework of the CC method.We illustrate the method by describing the PESs for HF,H_2O,and N_2 molecules which involve single,double,and triple bond-breaking processes.To the dissociation limit,this approach yields far more accurate PESs than those obtained from the conventional CC method and the additional computational cost is negligible compared with the CC calculation steps.We anticipate that TCC offers an effective and generally applicable approach for many problems.
机译:提出了一种结合耦合簇(CC)和构型相互作用(CI)来准确描述势能面(PESs)的方法。我们使用从完整活动空间CI计算中提取的簇振幅来操纵非动态相关性,以调整单个参考CC理论(TCC)。然后通过CC方法的框架纳入动态相关性。我们通过描述涉及单键,双键和三键断裂过程的HF,H_2O和N_2分子的PES来说明该方法。与解离极限相比,这种方法产生的PES比从常规CC方法获得的PES精确得多,与CC计算步骤相比,额外的计算成本可忽略不计。我们期望TCC为许多问题提供一种有效且普遍适用的方法。

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