Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 19: Collisions, scattering and correlation phenomena
A 19.5: Poster
Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof
Measuring and modeling of anisotropic and polarized x-ray emission following resonant recombination into highly charged ions — •Chintan Shah1,2, Pedro Amaro1, Holger Jörg1, René Steinbrügge2, Sven Bernitt2, Christian Beilmann1,2, Stephan Fritzsche3,4, Andrey Surzhykov3, José Ramón Crespo López-Urrutia2, and Stanislav Tashenov1 — 1Physikalisches Institute, Heidelberg, Germany — 2Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 3Helmholtz-Institut Jena, Jena, Germany — 4Theoretisch-Physikalisches Institut, Jena, Germany
The angular distribution and polarization of x rays emitted due to resonant recombination into highly charged ions were studied experimentally using an electron beam ion trap. In the first experiment, the linear polarization of x rays produced by dielectronic recombination into highly charged krypton ions was measured using the Compton polarimetry technique. In the second experiment, the electron-ion collision energy was scanned over the K-shell dielectronic, trielectronic and quadruelectronic recombination resonances in highly charged iron and krypton ions. The angular distribution of x rays following resonant recombination was measured by two detectors mounted along and perpendicular to the beam axis. The measured polarization and emission asymmetries comprehensively benchmarked full-order atomic calculations, confirming their suitability for the polarization diagnostics of hot plasmas under the premise of inclusion of higher order processes that were neglected in earlier work.