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A coupled cluster treatment of intramonomer electron correlation within symmetry-adapted perturbation theory: Benchmark calculations and a comparison with a density-functional theory description

机译:对称适应微扰理论内的单体内电子相关性的耦合簇处理:基准计算以及与密度泛函理论描述的比较

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摘要

Symmetry-adapted perturbation theory (SAPT) with intramonomer electron correlation described by coupled cluster theory limited to single and double excitations was applied to 21 noncovalent complexes in their minimum geometries. The resulting benchmark contributions to the interaction energy were utilized to examine the accuracy of a more approximate variant of the SAPT method, where interacting molecules are described by density functional theory (DFT) with different functionals, like LDA, PBE, B3LYP, PBE0, M05, M05-2X, M06, and M06-2X (in all cases the asymptotic correction for the exchange-correlation functional has been utilized). Average errors for individual energy components of SAPT(DFT) are not larger than 10% for best functionals under study. Among the tested functionals PBE0, M05, and B3LYP should be especially recommended for the SAPT(DFT) approach. The M06 functional gives the largest errors with respect to SAPT(CCSD) and should not be used for describing intramonomer correlation in SAPT.
机译:通过耦合簇理论(仅限于一次和两次激发)描述的具有单体内电子相关性的对称自适应扰动理论(SAPT)被应用于21种非共价复合物的最小几何形状。所产生的对相互作用能的基准贡献被用于检验SAPT方法的一个更近似变体的准确性,其中通过密度泛函理论(DFT)描述具有不同功能的相互作用分子,例如LDA,PBE,B3LYP,PBE0,M05 ,M05-2X,M06和M06-2X(在所有情况下,均已使用交换相关函数的渐近校正)。对于研究中的最佳功能,SAPT(DFT)的各个能量分量的平均误差不大于10%。在经过测试的功能中,对于SAPT(DFT)方法,应特别推荐PBE0,M05和B3LYP。 M06函数相对于SAPT(CCSD)给出最大的错误,不应用于描述SAPT中的单体内相关性。

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