Abstract
A simple variation-perturbation method recently developed is applied to the calculation of electron affinities. In this method a common basis is used for both the ion and the neutral system. The resulting secular equations are of a very small dimension. The matrix elements entering these equations can be evaluated by diagrammatic methods. The formalism is compared with the one-body Green's function method. The electron affinities of Li, Na, F, Cl, and OH are calculated.
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