The electron evaporation model, presented in a previous paper, of the collision-ionization process that occurs when atoms collide at high energies is extended and improved. In addition, an alternate model of the process is considered. This second model treats the collision-ionization process as being due to direct knock-outs of the electrons by violent electron-electron collisions. It is found that this model cannot be made to account for the data, thereby lending additional support to the assumptions inherent in the evaporation model.
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Russek et al. (1959) studied this question.
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