Collision dynamics in electron-capture processes with excitation

We have measured the projectile scattering-angle dependency for various electronic final states for single-electron capture in p+He and {sup 3}He{sup +}+He collisions at incident energies between 60 and 630 keV/u. We find pronounced peak structures in the scattering-angle dependence of some of the ratios of different capture channels. We interpret this as experimental evidence that an excitation process of the target is caused by a transverse momentum transfer that leads to an additional projectile deflection.