Inelastic differential scattering cross sections have been measured in the laboratory energy range of 200 to 350 eV using a time of flight technique. Energy losses are observed corresponding to excitation of each of the channels He(1s2)+He(1s2l) and He(1s2l)+He(1s2l). The results confirm the initial step in the recently proposed ionization mechanism of two electron excitation followed by autoionization as the particles dissociate.
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Morgenstern et al. (1973) studied this question.
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