アイテム詳細

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 2s2p_1/2 and 2s 2p_3/2 Δ_n=0 core excitations. Resonances related to Δ_n =1 and Δ_n=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⁺ (1s²p_j7l_j') intermediate states has been investigated with an energy resolution and precision that will challenge state-of-the-art theory.