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Abstract
AbstractThe unrestricted Hartree–Fock model of interacting electrons originated as an approximation that incorporates exchange‐polarization effects for open‐shell atoms and molecules. Spontaneous symmetry‐breaking is described by this model, in particular for dissociating covalent bonds, but is limited to exchange in the Hartree–Fock context. When this model is extended to an orbital functional theory, which can include quantitative effects of electronic correlation, it becomes a widely applicable formalism for many‐body theory. This conceptual extension is discussed. © 2004 Wiley Periodicals, Inc. Int J Quantum Chem, 2005
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