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The cross sections for Na(3s) +X → Na + +e +X, in which X is a proton or an electron, are calculated by the first Born approximation. In the proton case the cross section obtained passes through a maximum of 1.9 × 10 -15 cm 2 at an impact energy of 7.6 keV, and in the electron case it passes through a maximum 5.6 × 10 -16 cm 2 at an impact energy of 14 eV.
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Bates et al. (1965) studied this question.
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