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The simplified Kohn-Feshbach variational method is used to study the phase shifts for the P-wave electron-hydrogen system. Unlike earlier calculations where the curve fitting is used to calculate the width and the shift for a resonance state, we obtained these quantities by direct integration. This permits us to study the variation of Γ(E) and Δ(E) in the resonance region and a well-defined resonance energy position can be found. In the elastic region we obtained two resonances each for triplet and singlet states. These resonance positions compare favorably with previous accurate calculations.
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Ajmera et al. (1974) studied this question.
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