We have studied the fundamental process of ionization in a pure three-body ionatom collision involving atomic hydrogen as a target and a bare heavy-ion as a projectile. We report the measurements of the double-differential cross section (DDCS) of ionization for 2.5 MeV u −1 C 6+ + H (v = 10 au). The measurements of the energy and angular distributions of the double-differential cross sections of the low-energy electrons and a comparison with the CDW-EIS and FBA calculations provide a detailed understanding of the two-centre mechanism of electron emission. The forward-backward asymmetry parameters have also been studied. The DDCS ratio between molecular and atomic hydrogen shows a prominent structure.
We have measured the ratio of differential cross sections for the production of doubly and singly ionized He by fast protons at energies between 4 and 10 MeV. The ratio was measured as a function of proton scattering angle, from which the energy transfer was calculated using binary kinematics. The ratio is found to be near 1.25%, nearly independent of either proton energy or energy transfer. This value is lower than that reported previously for a similar experiment, but in good agreement with recent Compton scattering and theoretical results. ͓S1050-2947͑98͒05201-9͔
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