Time dependent Hartree-Fock theory, in its coupled and uncoupled forms, is used to calculate the elastic singlet p-wave phase shifts for the scattering of electrons by H and He + . On comparison with the best available results it is concluded that the coupled scheme, which contains correlation to a least first order, is superior. Levinson's theorem is confirmed.
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M. J. Jamieson (1972) studied this question.
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