Signatures of electron-electron interaction in fast highly charged ion-atom collisions

We report on calculations of differential electron spectra for double ioniz ation of helium by fast highly charged ion impact based on a first order Bo rn (shake-off) model. These spectra are shown to be very sensitive to the e lectron-electron interaction. The potential of recoil ion momentum spectros copy for investigating the correlated dynamics of electrons in multiple ion ization of atoms by fast heavy ion impact is discussed.