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A: Atomphysik

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

A 10.39: Poster

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

Storage ring measurement of the dielectronic recombination of Ar-like Sc³⁺ ions — •S. Schippers¹, S. Kieslich¹, A. Mü ller¹, G. Gwinner², M. Schnell², A. Wolf², M. Bannister³, and A. Covington⁴ — ¹Institut für Kernphysik, Universität Giessen, Germany — ²Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ³Oak Ridge National Laboratory, Tennessee, USA — ⁴University of Nevada, Reno, USA

The dielectronic recombination (DR) spectra of Ar-like ions such as Sc³⁺ and Ti⁴⁺ contain resonances associated with 3p⁵3d^2 2F intermediate states which decay very rapidly via Super-Coster-Kronig transitions. Therefore these resonances have large widths of up to ∼ 1.2 eV. Although they could not unambiguously be identified in previous measurements [1], large discrepancies between experimental and theoretical resonance positions of up to ∼ 4 eV have been found. Here we present new experimental results which have been taken under greatly improved experimental conditions and which facilitates a conclusive comparison between theory and experiment.

[1] S. Schippers et al., Phys. Rev. A. 59, 3092 (1999); J. Phys. B 31, 4873 (1998).