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We have measured electron-ion recombination for Fe$^{9+}$ forming Fe$^{8+}$and for Fe$^{10+}$ forming Fe$^{9+}$ using merged beams at the TSR heavy-ionstorage-ring in Heidelberg. The measured merged beams recombination ratecoefficients (MBRRC) for relative energies from 0 to 75 eV are presented,covering all dielectronic recombination (DR) resonances associated with 3s->3pand 3p->3d core transitions in the spectroscopic species Fe X and Fe XI,respectively. We compare our experimental results to multi-configurationBreit-Pauli (MCBP) calculations and find significant differences. From themeasured MBRRC we have extracted the DR contributions and transform them intoplasma recombination rate coefficients (PRRC) for astrophysical plasmas withtemperatures from 10^2 to 10^7 K. This spans across the regimes where each ionforms in photoionized or in collisionally ionized plasmas. For both temperatureregimes the experimental uncertainties are 25% at a 90% confidence level. Theformerly recommended DR data severely underestimated the rate coefficient attemperatures relevant for photoionized gas. At the temperatures relevant forphotoionized gas, we find agreement between our experimental results and MCBPtheory. At the higher temperatures relevant for collisionally ionized gas, theMCBP calculations yield a Fe XI DR rate coefficent which is significantlylarger than the experimentally derived one. We present parameterized fits toour experimentally derived DR PRRC.

Electron-ion Recombination of Fe X forming Fe IX and of Fe XI forming Fe X: Laboratory Measurements and Theoretical Calculations