Heidelberg 2015 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Poster: Collisions, scattering and recombination
A 26.2: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
Linear polarization of x-ray transitions due to dielectronic recombination in highly charged ions — •Holger Jörg1, Zhimin Hu1, Hendrik Bekker2, Michael Andreas Blessenohl2, Daniel Hollain2, Stephan Fritzsche3,4, Andrey Surzhykov3, José Ramón Crespo López-Urrutia2, and Stanislav Tashenov1 — 1Physikalisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany — 2Max-Plank-Institut für Kernphysik, Heidelberg, 69117 Heidelberg, Germany — 3Helmholtz-Institut Jena, 07743 Jena, Germany — 4Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany
Linear polarization of x-rays produced in the process of dielectronic recombination in highly charged xenon ions was studied at an electron beam ion trap by means of the Compton polarimetry technique. The experimental results are in all cases in good agreement with the theoretical predictions. In the specific case of the dielectronic recombination resonance exciting the [1s2s22p1/2]1 state, the Breit interaction between bound electrons strongly influences the polarization of the emitted x-rays. The results agree with the predictions which include the Breit interaction and by 5σ rule out the theory taking into account only the Coulomb electron-electron repulsion. Apart from the fundamental importance, the experimental results open numerous possibilities for polarization diagnostics of hot anisotropic plasmas. In particular the directions of the electrons in the plasmas, found e.g. in the accretion discs and jets of black holes, can be probed by measuring polarization of the satellite transitions in HCIs.