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A: Fachverband Atomphysik
A 26: Poster: Collisions, scattering and recombination
A 26.5: Poster
Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer
X-ray emission asymmetries in resonant recombination into highly charged iron ions — •Chintan Shah1, Pedro Amaro1, René Steinbrügge2, Christian Beilmann1, 2, Sven Bernitt2, Stephan Fritzsche3, 4, Andrey Surzhykov3, José Ramón Crespo López-Urrutia2, and Stanislav Tashenov1 — 1Physikalisches Institut, Heidelberg, Germany — 2Max-Plank-Institut für Kernphysik, Heidelberg, Germany — 3Helmholtz-Institut Jena, Jena, Germany — 4Theoretisch-Physikalisches Institut, Jena, Germany
We report the first systematic measurement of the photon angular distribution in the inter-shell dielectronic, trielectronic and quadroelectronic recombination of free electrons into highly charged ions of iron. Ions in He-like through O-like charge states were produced in an electron beam ion trap, and the electron-ion collision energy was scanned over the recombination resonances exciting a K-shell electron. Two germanium detectors mounted head-on and side-on with respect to the electron beam propagation recorded X rays emitted in the decays of resonantly populated states. The measured x-ray emission asymmetries indicate the alignment of those states. The corresponding alignment parameters were extracted for 40 dominant KLL recombination resonances providing a comprehensive data for benchmarking advanced atomic codes, such as FAC and RATIP. This data can also be used for modelling and diagnostics of hot astrophysical plasmas.