Measurement of level-specific dielectronic-recombination cross sections of heliumlike Fe xxv

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Abstract
The strengths of individual 1s2l2l’ resonances for dielectronic recombination of heliumlike iron are measured on an electron-beam ion trap using high-resolution x-ray spectroscopy. An energy resolution ΔE/E of better than 0.1% is achieved by monitoring the exit channel of the recombination process. Dielectronic-resonance strengths are measured relative to the cross section for nonresonant radiative electron capture of heliumlike Fe x x v, and an overall uncertainty of 20% is achieved. Good agreement with theory is found for the strongest resonances; however, less good agreement is found for the weaker resonances. The results indicate that further theoretical and experimental efforts are necessary to reliably use weak dielectronic satellite lines in plasma diagnostics.