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Dielectronic recombination at low energies: Spectroscopy of doubly excited states in beryllium-like Na7+ ions

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Schippers,  S.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Gwinner,  G.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Schnell,  M.
Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society;

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Wolf,  A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Kieslich, S., Böhm, S., Brandau, C., Müller, A., Schippers, S., Shi, W., et al. (2003). Dielectronic recombination at low energies: Spectroscopy of doubly excited states in beryllium-like Na7+ ions. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 205, 99-101.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-81A4-8
Abstract
Absolute rate coefficients for the dielectronic recombination (DR) of Na8+ ions producing doubly excited states in beryllium-like Na7+ have been measured at the Heidelberg heavy-ion test storage ring (TSR). The investigated electron energy range covers all DR resonances related to 2s2p1/2 and 2s 2p3/2 Δn=0 core excitations. Resonances related to Δn =1 and Δn=2 transitions of the valence electron are found at relative energies between 50 and 250 eV. At very low energies the resonance group associated with Na7+ (1s2pj7lj') intermediate states has been investigated with an energy resolution and precision that will challenge state-of-the-art theory.