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A: Fachverband Atomphysik

A 34: Poster II

A 34.17: Poster

Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster

Charge state selective observation of resonant electron-ion recombination processes in the Heidelberg-EBIT — Lodewijk Arntzen, •Sven Bernitt, Rainer Ginzel, Hiro Tawara, Christian Beilmann, José R. Crespo López-Urrutia, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

In an experiment at the Heidelberg-EBIT we observed dielectronic recombination in helium-like and lithium-like krypton, comparing the flux of extracted ions in neighbouring charge states, which were separated using a bending magnet and imaged with a multichannel plate detector equipped with a delay-line anode. In contrast to x-ray spectroscopic measurements, a striking feature of this method is the possibility to resolve resonances of ions in different charge states, even when they are blended in the x-ray spectrum. The experimental data were compared to predictions of DR cross sections, obtained with MCDF calculations and showed very good agreement.

In future experiments, it might be possible to detect resonant recombination processes of higher order, like trielectronic recombination (TR), which have recently been found at the Heidelberg-EBIT by spectroscopic methods.