A many-body optical potential Σ which has been demonstrated to give excellent electron-helium elastic scattering cross sections is analyzed. It is shown to encompass, yet be more general than, almost all previous model potentials used in electron scattering and Rydberg-state calculations. A partial semiempirical form of this potential is achieved. It is shown how Σ can be computed by methods of variation-perturbation theory.
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Csanak et al. (1972) studied this question.
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