Abstract
The enhancement of dielectronic recombination by applied electric fields has been observed and measured for the first time in a wide range of controlled and measurable fields using multiply charged ions. The heavy ion storage ring CRYRING at Stockholm University was used to store a beam of ${\mathrm{Si}}^{11+}$ and collide it with a cold electron target. Rydberg resonances up to $n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}25$ are resolved for both the ${2p}_{3/2}$ and ${2p}_{1/2}$ series. The observation of a substantial monotonic increase of the rate coefficient for the group of higher Rydberg states is in puzzling disagreement with theoretical calculations of electric field enhanced dielectronic recombination.
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