Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 37: Electron scattering and recombination
A 37.2: Vortrag
Donnerstag, 20. März 2014, 11:00–11:15, BEBEL E42
First systematic measurement of the photon emission anisotropy following resonant recombination into highly charged ions — •Chintan Shah1, Pedro Amaro1, René Steinbrügge2, Sven Bernitt2, Zoltan Harman2,3, Stephan Fritzsche4,5, Andrey Surzhykov4,5, José Ramón Crespo López-Urrutia2, and Stanislav Tashenov1 — 1Physikalisches Institut, Heidelberg, Germany — 2Max-Planck-Institut für Kernphysik Heidelberg, Germany — 3ExtreMe Matter Institute, Darmstadt, Germany — 4Helmholtz-Institut, Jena, Germany — 5GSI, Darmstadt, Germany
We report the first systematic measurement of the photon angular distribution in the inter-shell dielectronic and higher-order resonant electron recombination into highly charged ions. Iron and krypton ions in the He-like through O-like charge states were produced in an electron beam ion trap, and the electron beam energy was scanned over the K-shell dielectronic and higher-order recombination resonances. Improving on earlier work [1, 2], the photons emitted in the decay of the resonance states were simultaneously recorded by two germanium detectors which were mounted both along and perpendicular to the electron beam propagation direction. The measured photon emission asymmetries indicate the alignment of the total angular momentum of each resonance state with respect to the beam axis. The results can be used to benchmark atomic calculations, and can be applied for polarization diagnostics of hot astrophysical and laboratory fusion plasmas. [1] C. Beilmann et al., Phys. Rev. Lett. 107, 143201(2011) [2] C.Beilmann et al., Phys. Rev. A 88, 062706(2013)