Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 6: Scattering Processes
A 6.3: Talk
Monday, March 2, 2009, 17:30–17:45, VMP 6 HS-E
High resolution spectroscopy of Rydberg resonances in 2s2-2s2p dielectronic recombination of berylliumlike Ge — •Dmitry A. Orlov1, Claude Krantz1, Eva Lindroth2, Fabrizio Ferro2, Anton N. Artemyev3, Dietrich Bernhardt4, Carsten Brandau5, Jens Hoffmann1, Alfred Müller4, Ticia Ricsóka4, Stefan Schippers4, Andrey Shornikov1, and Andreas Wolf1 — 1Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany — 2Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden — 3Institute of Physics, Heidelberg University, D-69120 Heidelberg, Germany — 4Institut für Atom- und Molekülphysik, Universität Giessen, D-35392 Giessen, Germany — 5Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany
Low-energy dielectronic recombination resonances of beryllium-like Ge28+ are studied by electron collision spectroscopy in the TSR ion storage ring using its ultracold photoelectron target [1]. The rich resonance structure below 1.7 eV is observed with resolved peaks appearing also below 100 meV [2], which is mainly due to (2s2p 1P1)9l and (2s2p 3P0)14l dielectronic resonances. The calculation of Rydberg binding energies for the two-valence-electron core is challenged by these results (work in progress). Since radiative corrections are negligible in these high Rydberg orbits, the QED contributions are those of the 1S0−1P1 and 1S0−3P0 core transitions, which are thus probed by the experiment.
[1] D.A. Orlov, et. al., J.Phys.: Conf. Series 4, 290 (2005)
[2] D.A. Orlov, et. al., J.Phys.: Conf. Series (2008), to be published