A projection-operator technique is used to investigate the resonance states of two-electron systems in the inelastic scattering energy region. Computations are carried out for the P autoionization states for He and the H^- ion in the $n=2$ to $n=3$ energy region. The results are compared with previous calculations and experiments. For the ¹P resonance of He, very good agreement is obtained as compared with the accurate measurement of Madden and Codling.
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Kwong T. Chung (1972) studied this question.
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