Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster I

A 8.28: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

Optimization of the charge state distribution in an electron beam ion trap using dielectronic recombination — •Sven Bernitt, Rainer Ginzel, Lodewijk Arntzen, José R. Crespo López-Urrutia, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

When an energetic electron recombines with an ion, an inner-shell electron of the ion can be resonantly excited. The resulting excited state can decay radiatively, leaving the ion with its charge decreased by one (dielectronic recombination, DR). Due to large cross sections compared to non-resonant radiative recombination, DR has an substantial effect on the recombination rates in hot plasmas and thus on the charge state distribution. This can be systematically influenced due to the resonant nature of DR. To investigate this possibility highly charged krypton ions were extracted from the Heidelberg Electron Beam Ion Trap (HD-EBIT), separated into their charge states and counted as a function of the electron energy. Yield increases were observed in single charge states by factors larger than three, while other charge states were suppressed. These results further improve the unique ability of electron beam ion traps to generate ion beams in a very narrow charge state distribution, a highly desirable feature for example for studies of rare isotope ion beams.