Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 14: Posters: Interaction of matter with ions
A 14.7: Poster
Tuesday, March 11, 2008, 16:30–18:30, Poster C3
Quantum mechanical calculations of multiple-electron loss of fast heavy ions in gas targets — •Gerald Schenk1, Tom Kirchner1, and Viatcheslav Shevelko2 — 1Institut für Theoretische Physik, TU Clausthal, D-38678 Clausthal-Zellerfeld, Germany — 2P. N. Lebedev Physical Institute, 119991 Moscow, Russia
Current activities at accelerator facilities, e.g., in the framework of the FAIR project at GSI require precise knowledge of electron stripping cross sections for fast highly-charged ions in gas targets. As a first step toward the goal of providing cross section data for lowly-charged uranium ions from the MeV to the GeV regime we have considered electron loss from sixfold and eightfold argon ions in helium and argon gases at around 10 MeV/amu. Our calculations are based on the independent-electron approximation and the coupled-channels basis generator method (BGM) [1] for orbital propagation. In the case of Ar6+ ions we find that a considerable fraction of electron loss is due to ionization from the L-shell. Consequently, Auger processes have to be taken into account to arrive at realistic results for multiple-electron loss. Antiscreening also contributes considerably to the electron loss. It is not unlikely that both processes are also important for the uranium ions of interest at GSI [2].
References: [1] O.J. Kroneisen et al., J. Phys. A 32 (1999) 2141 [2] R.E. Olson et al., J. Phys. B 37 (2004) 4539