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The elastic scattering of electrons by helium atoms and the excitation of helium to the 2 1 S and 2 1 P states by electron and proton impact are investigated using a simplification of the second Born approximation in which the terms arising from the coupling to the 1 1 S, 2 1 S and 2 1 P states are evaluated exactly and those arising from couplings to all the higher singlet discrete states and continuum states are estimated by employing the closure formula.
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Holt et al. (1971) studied this question.
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