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We have performed a kinematically complete experiment for the transfer ionization reaction 0.15--1.4MeVp+He→H⁰+He²⁺+e^- by measuring the three-dimensional momentum vector of the He²⁺ ion in coincidence with the scattering angle and the plane of the H⁰. In the measured fourfold differential cross section we can clearly distinguish between the independent two-step process of capture plus ionization and the correlated e- e Thomas scattering. We find a vP^-7.4±1 scaling for the total cross section of the e- e Thomas process.
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Mergel et al. (1997) studied this question.
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