Electron propagator methods for calculating vertical electron detachment energies of closed-shell anions are compared with respect to accuracy and efficiency. Examination of self-energy terms and numerical tests on typical anions show that the partial third-order (P3) quasi-particle approximation is superior to the third-order and outer valence Green's function methods in both respects.
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Dolgounitcheva et al. (1997) studied this question.
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