Berlin 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
A: Fachverband Atomphysik
A 25: Poster: Electron scattering and recombination
A 25.6: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Observation of alignment in Dielectronic and Trielectronic recombination — •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
The photon angular distributions in dielectronic and trielectronic recombination with a K-shell excitation were systematically studied with highly charged ions. Fe and Kr 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 dielectronic and trielectronic recombination resonances. Improving on earlier work [1, 2], the photons emitted from the decay of the resonance states were simultaneously recorded by two germanium detectors which were mounted both along and perpendicular to the electron beam axis. The measured anisotropy of photon emission indicates 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 laboratory fusion and astrophysical plasmas.
[1] C. Beilmann et al., Phys. Rev. Lett. 107, 143201 (2011)
[2] C. Beilmann et al., Phys. Rev. A 88, 062706 (2013)