Polarization measurement of dielectronic recombination transitions in highly charged krypton ions

Chintan Shah, Holger Jörg, Sven Bernitt, Stepan Dobrodey, René Steinbrügge, Christian Beilmann, Pedro Amaro, Zhimin Hu, Sebastian Weber, Stephan Fritzsche, Andrey Surzhykov, José R. Crespo López-Urrutia, Stanislav Tashenov

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33 Citations (Scopus)


We report linear polarization measurements of x rays emitted due to dielectronic recombination into highly charged krypton ions. The ions in the He-like through O-like charge states were populated in an electron-beam ion trap with the electron-beam energy adjusted to recombination resonances in order to produce Kα x rays. The x rays were detected with a newly developed Compton polarimeter using a beryllium scattering target and 12 silicon x-ray detector diodes sampling the azimuthal distribution of the scattered x rays. The extracted degrees of linear polarization of several dielectronic recombination transitions agree with results of relativistic distorted-wave calculations. We also demonstrate a high sensitivity of the polarization to the Breit interaction, which is remarkable for a medium-Z element like krypton. The experimental results can be used for polarization diagnostics of hot astrophysical and laboratory fusion plasmas.

Original languageEnglish
Article number042702
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number4
Publication statusPublished - 7 Oct 2015


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