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• W4288694543 abstract "We examine the many-body expansion (MBE) for alkaline earth metal clusters, Ben, Mgn, Can (n = 4, 5, 6), at the Møller–Plesset second order perturbation theory, coupled-cluster singles and doubles with perturbative triples, multi-reference perturbation theory, and multi-reference configuration interaction levels of theory. The magnitude of each term in the MBE is evaluated for several geometrical configurations. We find that the behavior of the MBE for these clusters depends strongly on the geometrical arrangement and, to a lesser extent, on the level of theory used. Another factor that affects the MBE is the in situ (ground or excited) electronic state of the individual atoms in the cluster. For most geometries, the three-body term is the largest, followed by a steady decrease in absolute energy for subsequent terms. Though these systems exhibit non-negligible multi-reference effects, there was little qualitative difference in the MBE when employing single vs multi-reference methods. Useful insights into the connectivity and stability of these clusters have been drawn from the respective potential energy surfaces and quasi-atomic orbitals for the various dimers, trimers, and tetramers. Through these analyses, we investigate the similarities and differences in the binding energies of different-sized clusters for these metals." @default.
• W4288694543 created "2022-07-30" @default.
• W4288694543 creator A5003351801 @default.
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• W4288694543 date "2022-08-28" @default.
• W4288694543 modified "2023-09-27" @default.
• W4288694543 title "The many-body expansion for metals. I. The alkaline earth metals Be, Mg, and Ca" @default.
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• W4288694543 doi "https://doi.org/10.1063/5.0094598" @default.
• W4288694543 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36049988" @default.
• W4288694543 hasPublicationYear "2022" @default.
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