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キーワード:
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要旨:
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.
