ANGULAR SCATTERING EFFECTS IN ELECTRON CAPTURE BY MULTIPLY CHARGED IONS

Energy-gain measurements have been performed on 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 in energy-gain spectra that are shifted and deformed in such a way that they are difficult to resolve into contributions from different reaction channels unless a theoretical analysis including angular scattering effects is performed. We have developed a multichannel model for this purpose which also produces angular differential cross sections. An analysis has been made of the angular scattering present in the collision systems and theoretical energy gain spectra have been used in the assignment of reaction channels. As particular cases we show results from 300 eV O2+ and 200-2000 eV Kr6+ ions capturing one electron from He.