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A: Atomphysik

A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)

A 10.36: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT3

Lamb-shift measurements in very heavy Li-like ions utilizing dielectronic recombination — •C. Brandau¹, T. Bartsch¹, S. Böhm¹, C. Böhme¹, F. Bosch², B. Franzke², N. Grün³, A. Hoffknecht¹, S. Kieslich¹, H. Knopp¹, C. Kozhuharov², A. Krämer², P. Mokler², A. Müller¹, F. Nolden², W. Scheid³, S. Schippers¹, W. Shi¹, Z. Stachura⁴, M. Steck², T. Steih³, and T. Stöhlker² — ¹Institut für Kernphysik, Universität Giessen, Germany — ²Gesellschaft für Schwerionenforschung, Darmstadt, Germany — ³Institut für Theoretische Physik, Universität Giessen, Germany — ⁴Institute for Nuclear Physics, Krakow, Poland

A novel method will be presented which facilitates the precise determination of excitation energies. The main idea is to extrapolate the energies of individual dielectronic recombination (DR) Rydberg-resonances to the associated series limit. Measurements of the 1s²2p_1/2 n ℓ_j (n ≥ 20) resonance manifolds for the DR of the Li-like ions Au⁷⁶⁺, Pb⁷⁹⁺ and U⁸⁹⁺ will be presented. Results for the 2s_1/2 − 2p_1/2 splitting (Lamb-shift) of these ions will be given. The accuracy of this new method is comparable to the most precise experiments available for very heavy ions (e.g. [1]), and is sufficient to test QED in strong fields up to the order of α².

[1] J. Schweppe et al., Phys. Rev. Lett. 66, 1434 (1991)