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Recent spectroscopic models of active galactic nuclei (AGN) have indicatedthat the recommended electron-ion recombination rate coefficients for iron ionswith partially filled M-shells are incorrect in the temperature range wherethese ions form in photoionized plasmas. We have investigated thisexperimentally for Fe XIV forming Fe XIII. The recombination rate coefficientwas measured employing the electron-ion merged beams method at the Heidelbergheavy-ion storage-ring TSR. The measured energy range of 0-260 eV encompassedall dielectronic recombination (DR) 1s2 2s2 2p6 3l 3l' 3l'' nl''' resonancesassociated with the 3p1/2 -> 3p3/2, 3s -> 3p, 3p -> 3d and 3s -> 3d coreexcitations within the M-shell of the Fe XIV 1s2 2s2 2p6 3s2 3p parent ion.This range also includes the 1s2 2s2 2p6 3l 3l' 4l'' nl''' resonancesassociated with 3s -> 4l'' and 3p -> 4l'' core excitations. We find that in thetemperature range 2--14 eV, where Fe XIV is expected to form in a photoionizedplasma, the Fe XIV recombination rate coefficient is orders of magnitude largerthan previously calculated values.Comment: 4 pages, 4 figures, 1 table submitted to Ap

Electron-Ion Recombination Measurements Motivated by AGN X-Ray Absorption Features: Fe xiv Forming Fe xiii