Recombination Measurements at Low Energies with Au49+,50+,51+ at the TSR

Uwira, O; Muller, A; Linkemann, J; Bartsch, T; Brandau, C; Schmitt, M; Wolf, A; Schwalm, D; Schuch, R; Zong, W; Lebius, H; Graham, W G; Doerfert, J; Savin, Daniel Wolf

Recombination of Au49+, Au50+, and Au51+ ions has been studied at the TSR. With Au50+ ions a storage lifetime of only 2 to 4 s was observed with the magnetically expanded electron beam of the cooler at a density of ne = 107 cm-3. This short storage time is a consequence of the highest recombination rate coefficient ever observed with an atomic ion (1.8·10-6 cm3 s-1 at zero relative energy Erel = 0 between electrons and ions). At about 30 meV a huge dielectronic recombination resonance is found with a record small width of only about 15 meV. Such resonances fortuitously occurring near Erel=0 are probably the main reason for the enhanced recombination rates observed with Au50+, with Pb53+ (in a recent experiment at LEAR) as well as with other complex ions. For Au49+ and Au51+ the recombination rates are smaller by an order of magnitude.


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Hyperfine Interactions

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Astronomy and Astrophysics
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March 15, 2023