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Quantum Monte Carlo Calculation of Correlation Effects on Bond Orders
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Structural Chemistry.
2007 (English)In: Theoretical Chemistry accounts, ISSN 1432-881X, E-ISSN 1432-2234, Vol. 117, no 1, 41-48 p.Article in journal (Refereed) Published
Abstract [en]

We present a computational approach, using quantum Monte Carlo, that provides some insight into the effect of electron correlation on chemical bonding between individual pairs of atoms. Our approach rests upon a recently suggested relation between the bond order and charge fluctuations with respect to atomic domains. Within the present implementation we have taken a compromise between conceptual rigour and computational simplicity. In a first step atomic domains were obtained from Hartree-Fock (HF) densities, using Bader’s definition of atoms in molecules. These domains were used in a second step in quantum Monte Carlo calculations to determine bond orders for pairs of atoms. Correlation effects have been studied by comparison of HF bond orders with those obtained from pure diffusion quantum Monte Carlo calculations. We illustrate this concept for C–O and C–S bonds in different molecular environments. Our results suggest an approximate linear relation between bond order and bond length for these kinds of bonds.

Place, publisher, year, edition, pages
2007. Vol. 117, no 1, 41-48 p.
Keyword [en]
Quantum Monte Carlo, Charge fluctuations, Bond order, Electron correlation
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-20835DOI: 10.1007/s00214-006-0131-3ISI: 000243262300004OAI: oai:DiVA.org:uu-20835DiVA: diva2:48608
Available from: 2006-12-13 Created: 2006-12-13 Last updated: 2011-02-17Bibliographically approved

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