For pt. I see ibid., vol.6, 259 (1973). The Born I and Born II approximations are discussed in the context of double ionization, and their behaviour at high energy compared with experiment. The Born I approximation, excluding exchange, is used to calculate total and partial cross sections for the double ionization of H - , He and Li + , with various approximations used for the final state of the system, some of these being found to give good agreement with experiment.
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R J Tweed (1973) studied this question.