A new variant of Hartree-Fock, Convex HF, projects out the unstable orbital rotation near a conical intersection and reintroduces it in a final diagonalization, giving continuous ground- and excited-state surfaces.
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Convex Hartree-Fock theory: A simple framework for ground state conical intersections
A new variant of Hartree-Fock, Convex HF, projects out the unstable orbital rotation near a conical intersection and reintroduces it in a final diagonalization, giving continuous ground- and excited-state surfaces.