Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 28: Poster: Interaction of matter with ions
A 28.5: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.V
Dynamics of transfer ionization in 1MeV/u O7+ on He collisions — •Katharina Schneider1,2, Michael Schulz3, Aditya Kelkar1,4, Xincheng Wang1,2, Manfred Grieser1, Robert Moshammer1, Joachim Ullrich1, and Daniel Fischer1 — 1MPI für Kernphysik, Heidelberg, Germany — 2EMMI at GSI, Darmstadt, Germany — 3Missouri University of Science and Technology, Rolla, USA — 4Universität Innsbruck, Austria
In ion-atom collisions, the capture of one target electron with simultaneous emission of a second target electron may occur. This process is called Transfer Ionization and has gained much interest in recent years. Here the correlation between the target electrons plays an important role, as it is involved in several mechanisms that result in this two-electron transition. Two of them are in the literature referred to as Thomas transfer ionization and ee-process which both have a distinct signature in the final momentum space. At large perturbations η (projectile charge to velocity ratio), an independent process dominates, where capture and ionization can be considered as two separate interactions with the projectile. We studied Transfer Ionization in O7+ + He collisions obtaining kinematically complete information with a Reaction Microscope implemented at the Test Storage Ring TSR at the MPI-K. The differential cross sections are compared to single ionization and severe differences were observed. Here we present the data as well as a comparison to several theoretical models.