Abstract
We report on an experimental and theoretical systematic study of double ionization of helium by ion impact in terms of four-particle Dalitz plots. Several collision systems covering a broad range of perturbation parameters $\ensuremath{\eta}$ (projectile charge to speed ratio) were investigated. With increasing $\ensuremath{\eta}$ we observe a systematic trend from features, characteristic to correlated double-ionization mechanisms, to signatures of higher-order processes not requiring electron-electron correlations [the mechanism called ``two-step--two projectile-electron interaction'' (TS-2)]. The data for the largest $\ensuremath{\eta}$ can qualitatively be amazingly well described by a simple model only including the TS-2 mechanism.
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