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We have measured resonance strengths and energies for dielectronicrecombination (DR) of Mg-like Fe XV forming Al-like Fe XIV via N=3 -> N' = 3core excitations in the electron-ion collision energy range 0-45 eV. Allmeasurements were carried out using the heavy-ion Test Storage Ring at the MaxPlanck Institute for Nuclear Physics in Heidelberg, Germany. We have alsocarried out new multiconfiguration Breit-Pauli (MCBP) calculations using theAUTOSTRUCTURE code. For electron-ion collision energies < 25 eV we find pooragreement between our experimental and theoretical resonance energies andstrengths. From 25 to 42 eV we find good agreement between the two forresonance energies. But in this energy range the theoretical resonancestrengths are ~ 31% larger than the experimental results. This is larger thanour estimated total experimental uncertainty in this energy range of +/- 26%(at a 90% confidence level). Above 42 eV the difference in the shape betweenthe calculated and measured 3s3p(^1P_1)nl DR series limit we attribute partlyto the nl dependence of the detection probabilities of high Rydberg states inthe experiment. We have used our measurements, supplemented by ourAUTOSTRUCTURE calculations, to produce a Maxwellian-averaged 3 -> 3 DR ratecoefficient for Fe XV forming Fe XIV. The resulting rate coefficient isestimated to be accurate to better than +/- 29% (at a 90% confidence level) fork_BT_e > 1 eV. At temperatures of k_BT_e ~ 2.5-15 eV, where Fe XV is predictedto form in photoionized plasmas, significant discrepancies are found betweenour experimentally-derived rate coefficient and previously publishedtheoretical results. Our new MCBP plasma rate coefficient is 19-28% smallerthan our experimental results over this temperature range.

Dielectronic Recombination of Fe XV forming Fe XIV: Laboratory Measurements and Theoretical Calculations