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A method is proposed for obtaining critical energies and angles for the scattering of electrons by atoms. The method requires phaseshifts only at three energies. The critical points have also been computed in the static-field approximation for the light atoms having atomic numbers 6 to 10. The values of the critical points obtained by the proposed method are in excellent agreement with the computed values.
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Khare et al. (1980) studied this question.
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