Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 31: Poster Session III
A 31.21: Poster
Donnerstag, 9. März 2017, 17:00–19:00, P OG1
Strong higher-order resonant contribution to x-ray line polarization in hot anisotropic plasmas — •Chintan Shah1, Pedro Amaro2, René Steinbrügge1, Sven Bernitt1, 3, Stephan Fritzsche3, Andrey Surzhykov4, José Ramón Crespo López-Urrutia1, and Stanislav Tashenov2 — 1Max-Plank-Institut für Kernphysik, Heidelberg, Germany — 2Physikalisches Institut, Heidelberg, Germany — 3Friedrich-Schiller-Universität Jena, Jena, Germany — 4Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
The angular distribution and polarization of x rays emitted due to resonant recombination were experimentally studied using an electron beam ion trap. The electron-ion collision energy was scanned over the KLL dielectronic, trielectronic and quadruelectronic recombination resonances of Fe18+..24+ and Kr28+..34+ with an excellent resolution of ∼ 6 eV. The angular distribution of x rays was measured along and perpendicular to the beam axis. Subsequently, polarization was measured using Compton polarimetry [1]. We observed that most of the x-ray transitions lead to polarization including higher-order trielectronic and quadruelectronic resonances. These channels dominate the polarization of the dominant Kα x-ray line emitted by hot plasmas [2]. We conclude that accurate plasma polarization diagnostics can only be obtained with the careful inclusion of relativistic Breit interaction [3] and hitherto neglected higher-order resonances [2].[1] C. Shah et al., PRA 92, 042702 (2015)[2] C. Shah et al., PRE 93, 061201(R) (2016)[3] P. Amaro et al., submitted (2016).