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A: Atomphysik

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

A 10.34: Poster

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

Dielectronic recombination of lithiumlike Sc¹⁸⁺ and F⁶⁺ at threshhold: a challenge for atomic structure theory — •S. Kieslich¹, S. Böhm¹, A. Hoffknecht¹, A. Müller¹, S. Schippers¹, W. Shi¹, G. Gwinner², M. Schnell², A. Wolf², E. Lindroth³, and M. Tokman³ — ¹Institut für Kernphysik, Universität Giessen, Germany — ²Max-Planck-Institut für Kernphysik, Germany — ³Department of Physics, Stockholm University, Sweden

Absolute rate coefficients for dielectronic recombination (DR) of lithiumlike Sc¹⁸⁺ and F⁶⁺ ions have been measured at the Heidelberg heavy-ion Test Storage Ring (TSR). The investigated electron energy ranges (0 to 60 eV for Sc¹⁸⁺ and 0 to 15 eV for F⁶⁺) cover all DR resonances related to 2s→ 2p_1/2 and 2s→ 2p_3/2 Δ n=0 core excitations. Special attention is given to low energy DR resonances which can be measured with very high resolution (energy spreads down to 3 meV). For Sc¹⁸⁺ and F⁶⁺ these are associated with 1s² 2p_3/2 10l_j and 1s² 2p_j 6l_j′ intermediate states respectively. Both spectra show a very good agreement between experiment and relativistic many body perturbation theory including QED effects.