Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 34: Poster II
A 34.23: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
Dielectronic Recombination of Li- and Be-like Xenon Ions — •Dietrich Bernhardt1, Sebastian Böhm1, Holger Knopp1, Stefan Kieslich1, Paul Mokler1, Alfred Müller1, Stefan Schippers1, Wei Shi1, Peter Beller2, Fritz Bosch2, Carsten Brandau2, Christophor Kozhuharov2, Fritz Nolden2, and Markus Steck2 — 1Institut für Atom- und Molekülphysik, Justus-Liebig-Universität, 35392 Giessen, Germany — 2Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany
Dielectronic recombination (DR) rate coefficients of Li-like Xe51+ and Be-like Xe50+ have been measured by employing the merged electron-ion beam technique at GSI’s heavy-ion storage ring ESR in a center-of-mass energy range from 0 to 550 eV. Due to the kinematics of the merged-beams arrangement the highest precision for the determination of energies can be obtained for resonances at very low relative energies. During DR, electrons populate highly exited autoionising Rydberg states. These states, particularly in highly charged heavy ions, lend themselves to precision spectroscopy. The resonance strength and energy are both sensitive to QED contributions and finite nuclear radius effects. Measurements with few electron Xenon ions close the gap between measurements with lighter low electron ions at TSR[1] and earlier measurements with heavy low electron ions at ESR[2].
[1] S. Schippers et al. Phys. Rev. A. 62, 022708 (2000)
[2] C. Braundau et al. Phys. Rev. Lett. 89, 053201 (2002)