Translational energy-gain spectra for single charge exchange in A6++He (A=Ne,Ar,Kr,Xe) collisions at 200-2000 eV energy have been recorded. It is found that in all systems at least two final channels are active. The experiments are compared with a simple semiclassical multistate collision model. The influence of angular scattering effects on energy-gain spectra is examined.
The ^P shape resonance of H~ has been populated in collisions between H~ and Xe. We report on the decay H-C^P)-*H^(« = 2)4-^", which for the first time is measured by high-resolution electron spectroscopy. New information on the angular distribution of ejected electrons is obtained by use of a Shore parametrization to describe the cross section. The Shore parameters are related to matrix elements of the transition operator. The obtained resonance energy and width are in good agreement with recent theoretical calculations as well as other experimental results.
Energy-gain measurements have been performed o n single-electron capture reactions with low-energy heavy multiply charged ions colliding with He. Because of the large mass ratio between projectile and target, a non-negligible recoil energy is taken up by the target. This results i n energy-gain spectra that are shifted and deformed in such a way that they are difFcult t o resolve into contributions from different reaction channels unfess a theoretical analysis including angular scattering effects is performed. W e have developed a multichannel model for this purpose which also produces angular differential cross sections. A n analysis has been made of the angular scattering present i n the collision systems and theoretical energy gain spectra have been used i n the assignment of reaction channels. A s particular cases we show results from 300 e V 02+ and 200-2000 e V Kr6+ ions capturing one electron from He.
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