Berlin 2001 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.4: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Simultaneous Projectile- and Target-Ionization in 3.6 MeV/u C2+ on He Collisions — •H. Kollmus1,2, S. Hagmann3, R. Moshammer2, M. Schulz4, R.E. Olson4, R. Mann2, and J. Ullrich1 — 1Universiät Freiburg, Germany — 2GSI-Darmstadt, Germany — 3Kansas State University, USA — 4University of Missouri, USA
It is well known that projectile ionization in certain ion-atom collisions originates from the interaction between target- and projectile electrons. Here, projectile ionization can be interpreted as a result of electron impact by a quasi-free electron (bound in the target helium-atom) with an electron energy in the projectile frame equivalent to the projectile velocity in the laboratory frame. Using the “GSI Reaction-Microscope” we performed a kinematically complete experiment, measuring the charged changed projectile in coincidence with the two outgoing electrons and the recoiling target ion. In this 4-particle coincidence the full momentum vector for all fragments is mapped. Since we are able to distinguish between reaction channels ((e,e) and (n,e)), the electron-electron interaction (e,e) can be isolated. Thus, we are able to derive for the full comprehensive range of momentum transfer the triple differential (e,2e) cross section for electron impact ionization of a C2+ ion at 2keV equivalent electron energy. In the poster we demonstrate the experimental technique and discuss the results in comparison to theory.