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• W2316372932 abstract "A previously proposed [M. Piris, X. Lopez, F. Ruipérez, J. M. Matxain, and J. M. Ugalde, J. Chem. Phys. 134, 164102 (2011)] formulation of the two-particle cumulant, based on an orbital-pairing scheme, is extended here for including more than two natural orbitals. This new approximation is used to reconstruct the two-particle reduced density matrix (2-RDM) constrained to the D, Q, and G positivity necessary conditions of the N-representable 2-RDM. In this way, we have derived an extended version of the Piris natural orbital functional 5 (PNOF5e). An antisymmetrized product of strongly orthogonal geminals with the expansion coefficients explicitly expressed by the occupation numbers is also used to generate the PNOF5e. The theory is applied to the homolytic dissociation of selected diatomic molecules: H2, LiH, and Li2. The Bader's theory of atoms in molecules is used to analyze the electron density and the presence of non-nuclear maxima in the case of a set of light atomic clusters: Li2, Li3(+), Li4(2+), and H3(+). The improvement of PNOF5e over PNOF5 was observed by visualizing the electron densities." @default.
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• W2316372932 date "2013-12-17" @default.
• W2316372932 modified "2023-10-01" @default.
• W2316372932 title "The intrapair electron correlation in natural orbital functional theory" @default.
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• W2316372932 doi "https://doi.org/10.1063/1.4844075" @default.
• W2316372932 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24359354" @default.
• W2316372932 hasPublicationYear "2013" @default.
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