Multi-component symmetry-projected approach for molecular ground state correlations
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The symmetry-projected Hartree–Fock ansatz for the electronic structure problem can efficiently account for static correlation in molecules, yet it is often unable to describe dynamic correlation in a balanced manner. Here, we consider a multi-component, systematically improvable approach, that accounts for all ground state correlations. Our approach is based on linear combinations of symmetry-projected configurations built out of a set of non-orthogonal, variationally optimized determinants. The resulting wavefunction preserves the symmetries of the original Hamiltonian even though it is written as a superposition of deformed (broken-symmetry) determinants. We show how short expansions of this kind can provide a very accurate description of the electronic structure of simple chemical systems such as the nitrogen and the water molecules, along the entire dissociation profile. In addition, we apply this multi-component symmetry-projected approach to provide an accurate interconversion profile among the peroxo and bis(μ-oxo) forms of [Cu2O2]2+, comparable to other state-of-the-art quantum chemical methods.
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Jiménez-Hoyos, Carlos A., Rodríguez-Guzmán, R. and Scuseria, Gustavo E.. "Multi-component symmetry-projected approach for molecular ground state correlations." The Journal of Chemical Physics, 139, no. 20 (2013) American Institute of Physics: https://doi.org/10.1063/1.4832476.