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.
State selective c r o s sections for charge exchange collisions between 05+ and H have been calculated for ion energies ranging from 0.03 to 1155 eV mu-'.Capture to the 49, 4p and 4d levels of O ' + dominates over the whole energy r e pion. At the highest energies ow results are in agrement with recent merged-beams experiments. However, between 1 and 10 eV mu-' there is a significant discrep ancy between theory and experiment. The experimental cross section exhibits a pronounced minimum at about 2 eV mu-' while the calculated cross section shows a much less rapid variation. We have calculated the differential cross sections in the energV range 0.87 to 17.4 eV m u -' to investigate in detail the angular scattering properties of this system We tind evidence that the diiscrepaney may be e x p k i e d as due to the Limited angular acceptance of the experiment.
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