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arXiv · 2402.08767

Laboratory Benchmark of $n\geq4$ Dielectronic Recombination Satellites of Fe XVII

Gabriel J. Grell·Maurice A. Leutenegger·Pedro Amaro·José R. Crespo López-Urrutia·Chintan Shah
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Abstract

We calculated cross sections for the dielectronic recombination (DR) satellite lines of Fe XVII and benchmarked our predictions with experimental cross sections of Fe XVII resonances that were mono-energetically excited in an electron beam ion trap. We extend the benchmark to all resolved DR and direct electron-impact excitation (DE) channels in the experimental dataset, specifically the $n\geq4$ DR resonances of Fe XVII, complementing earlier investigations of $n=3$ channels. Our predictions overestimate by 20-25$\%$ the DR and DE absolute cross sections for the higher $n$ complexes when using the same methods as in previous works. However, we achieve agreement within $\sim$10$\%$ of the experimental results by an approach in which we "forward fold" the predicted cross sections with the spread of the electron-beam energy and the photon-energy resolution of our experiment. We then calculated rate coefficients from the experimental and theoretical cross sections, finding departures of $10-20\%$ from the rates found in the OPEN-ADAS atomic database.

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Gabriel J. Grell, Maurice A. Leutenegger, Pedro Amaro, José R. Crespo López-Urrutia, Chintan Shah. 2024-02-13. Laboratory Benchmark of $n\geq4$ Dielectronic Recombination Satellites of Fe XVII. https://arxiv.org/abs/2402.08767

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