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We report the first measurements on radiative and dielectronic recombination (RR and DR) of very highly charged ions at energies Ecm as low as 0 to 50 eV. Novel techniques were employed at the heavy-ion storage ring ESR to obtain absolute recombination rates of Au⁷⁶⁺(1s²2s). The increase of the RR rate for Ecm{→}0 could be recorded and single DR resonances in Au⁷⁵⁺(1s²2p3/26lⱼ) resolved. The experimental data allow sensitive judgement of calculations based on the Bethe-Salpeter approach to RR combined with results for DR from perturbative-relativistic, semirelativistic, and fully relativistic theories. Significant discrepancies are found only in the energy region of the 2p3/26l3/2 resonances.
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Spies et al. (1992) studied this question.
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