Systematic analysis of double-ionization dynamics based on four-body Dalitz plots

D. Fischer*, M. Schulz, K. Schneider, M. F. Ciappina, T. Kirchner, A. Kelkar, S. Hagman, M. Grieser, K. U. Kühnel, R. Moshammer, J. Ullrich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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 η (projectile charge to speed ratio) were investigated. With increasing η 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 η can qualitatively be amazingly well described by a simple model only including the TS-2 mechanism.

Original languageEnglish
Article number062703
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number6
StatePublished - 3 Dec 2009
Externally publishedYes


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