Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 25: Poster: Electron scattering and recombination
A 25.5: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
Polarisation measurement of Dielectronic Recombination transitions into highly charged ions — •Holger Jörg1, Chintan Shah1, Sven Bernitt2, Stepan Dobrodey2, José R. Crespo López-Urrutia2, and Stanislav Tashenov1 — 1Physikalisches Institut der Universität Heidelberg — 2Max-Planck-Institut für Kernphysik Heidelberg
We report a measurement of hard X-ray linear polarisation produced by dielectronic recombination (DR) of free electrons into highly charged krypton ions. The ions in the He-like through O-like charge states were produced in an electron beam ion trap, FLASH-EBIT. The electron beam energy was adjusted to the maxima of well-resolved K-shell DR resonances. The X rays emitted during radiative stabilization at an energy of 13 keV were registered by a novel Compton polarimeter. This instrument uses an X-ray scattering target and an array of silicon detectors for sampling the azimuthal scattering angular distribution. The preliminary analysis indicates a large degree of linear polarisation of the DR X rays. These results can be used to benchmark atomic calculations, and can also be applied for polarisation diagnostics of hot astrophysical and laboratory fusion plasmas.