Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 23: Poster: Electron scattering and recombination

A 23.1: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.V

Dielectronic recombination of highly charged iron measured by extracting ions from an EBIT — •René Steinbrügge, Sven Bernitt, Christian Beilmann, José R. Crespo López-Urrutia, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Dielectronic recombination (DR) is the resonant capture of an electron into a highly charged ion with the kinetic energy transferred to a bound electron, resulting in a doubly excited state. Due to large cross sections compared with non-resonant processes, it is highly important in hot plasmas. Electron beam ion traps (EBIT) are suitable tools for investigating this process. We present DR measurements of He-, Li- and Be-like iron carried out at the FLASH-EBIT. In addition to X-rays emitted during the relaxation of the excited state, DR was detected by the change in the charge state distribution. For this purpose the ions were extracted from the EBIT, charge separated by a Wien-type velocity filter and detected on a position sensitive detector. This allows to distinguish the contributions of different charge states. During the measurement new methods based on analysis of the extracted ions and space charge compensation were successful tested, promising further improvements in future experiments.