Erlangen 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 33: Poster Session II
A 33.24: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
Polarization of resonanly excited X-ray line — •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
X-ray polarization and anisotropy 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 x-ray asymmetries were measured by two detectors along and perpendicular to the beam axis. Direct polarization was also measured using Compton polarimetry [1]. We observed that most of the x-ray transitions lead to polarization including higher-order resonances. These channels influence not only the charge balance but also the polarization of the dominant Kα x-ray line emitted by hot plasmas [2]. We conclude that the careful inclusion of relativistic Breit interaction [3] and hitherto neglected higher-order channels [2] is necessary to construct reliable plasma models diagnostics.[1] C. Shah et al., PRA 92, 042702 (2015)[2] C. Shah et al., PRE 93, 061201(R) (2016)[3] P. Amaro et al., PRA 95, 0227012 (2017).