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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Active-Space Pair Two-Electron Reduced Density Matrix Theory for Strong Correlation
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Active-Space Pair Two-Electron Reduced Density Matrix Theory for Strong Correlation

机译:主动空间对双电子降低密度矩阵理论强相相关

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An active-space variational calculation of the two-electron reduced density matrix (2-RDM) is derived and implemented where the active orbitals are correlated within the pair approximation. The pair approximation considers only doubly occupied configurations of the wave function, which enables the calculation of the 2-RDM at a computational cost of (r(3)). Calculations were performed both with the pair active-space configuration interaction (PASCI) method and the pair active-space self-consistent field (PASSCF) method. The latter includes a mixing of the active and inactive orbitals through unitary transformations. The active-space pair 2-RDM method is applied to the nitrogen molecule, the p-benzyne diradical, a newly synthesized biscobalt complex, and the nitrogenase cofactor FeMoco. The FeMoco molecule is treated in a [120,120] active space. Fractional occupations are recovered in each of these systems, indicating the presence of strong electron correlation.
机译:导出和实现双电子减小密度矩阵(2-RDM)的有效空间变分算法,其中有源轨道在对近似内相关。 该对近似仅考虑波函数的双重占用配置,其能够以(R(3))的计算成本计算2-RDM。 用该对有源空间配置交互(PASCI)方法和该对有源空间自我一致性字段(PASSCF)方法进行计算。 后者包括通过整体变换混合活性和无活性轨道。 将活性空间对2-RDM方法应用于氮素分子,p-苯并二核,新合成的锥形络合物和氮酶Cofactor Femoco。 在[120,120]的活动空间中,雌肥分子被治疗。 在这些系统中的每一个中恢复分数占用,表明存在强电子相关的存在。

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