Capture, ionisation and loss in swift He1,2+-He collisions investigated by cold target recoil ion momentum spectroscopy

For 0.25-2MeV He2+-He and He+-He collisions we have measured the recoil ion momentum distribution in three dimensions for single capture, target ionisation and projectile electron loss. From these double differential cross sections we obtain state selective and scattering angle dependent cross sections for the single capture process and are able to distinguish between electron-electron and nucleus-electron interactions for the projectile electron loss. (orig.)