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Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Scattering Processes

A 6.3: Vortrag

Montag, 2. März 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 Wolf11Max-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 1S01P1 and 1S03P0 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

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