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- W2014243555 abstract "General expressions to the third order of perturbation theory for a direct calculation of the excitation energies of closed shell atomic and molecular systems are presented. The Hartree-Fock ground state orbitals are used as single particle states, but the method may be easily generalized for an arbitrary one-electron basis. The derivation is based on the Green function and diagrammatic approaches. A ``double projection'' scheme is developed which enables not only a very effective reduction of the number of Feynman diagrams which must be explicitly considered but also yields very compact formulas for the excitation energies, which may be easily implemented on a computer. The method is illustrated and checked on a simple six-electronic model system for which the exact solutions are available." @default.
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- W2014243555 title "Green's function approach to the direct perturbation calculation of the excitation energies of closed shell fermion systems" @default.
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- W2014243555 doi "https://doi.org/10.1063/1.1680762" @default.
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