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arXiv 1908.09914physics.chem-phcond-mat.str-elphysics.comp-ph
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捕获与$Δ\text{NO}$ - MP2和$Δ\text{NO}$ - CCSD的静态和动态相关性

Capturing static and dynamic correlation with $Δ\text{NO}$-MP2 and $Δ\text{NO}$-CCSD

Joshua W. Hollett, Pierre-François Loos

摘要:

静态关联的$Δ\text{NO}$方法与二阶Møller-Plesset微扰理论(MP2)和耦合团簇单双(CCSD)方法相结合来解释动态关联。MP2和CCSD的表达式改编自有限温度CCSD,其中包括轨道占位和空位,以及扩展的轨道总和。在MP2和CCSD残差方程中加入阻尼因子,对相关性进行了划分。势能曲线的选择的pacerics外推的全组态相互作用的结果(exFCI),并与传统的多参考方法相当。

英文摘要:

The $Δ\text{NO}$ method for static correlation is combined with second-order Møller-Plesset perturbation theory (MP2) and coupled-cluster singles and doubles (CCSD) to account for dynamic correlation. The MP2 and CCSD expressions are adapted from finite-temperature CCSD, which includes orbital occupancies and vacancies, and expanded orbital summations. Correlation is partitioned with the aid of damping factors incorporated into the MP2 and CCSD residual equations. Potential energy curves for a selection of diatomics are in good agreement with extrapolated full configuration interaction results (exFCI), and on par with conventional multireference approaches.

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