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The methods developed in a previous paper to study the ionization cross sections of H, He, Li and Be in their ground states using the Born approximation have been used to extend these calculations to neutral systems with outer 3s electrons. The results obtained are qualitatively similar to those for lithium and beryllium and, in the case of sodium, good agreement is obtained with the recent calculations of Bates, Boyd and Prasad.
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G. Peach (1966) studied this question.
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