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Comprehensive Laboratory Benchmark of K-shell Dielectronic Satellites of Fe xxv–xxi Ions
Publication . Shah, Chintan; Amaro, Pedro; Grilo, Filipe; Gu, Ming Feng; Gu, Liyi; Santos, José Paulo; Porter, F. Scott; Pfeifer, Thomas; Leutenegger, Maurice A.; López-Urrutia, José R. Crespo; DF – Departamento de Física; LIBPhys-UNL
We report on comprehensive laboratory studies of the K-shell dielectronic recombination resonances of Fe xxv-xxi ions that prominently contribute to the hard X-ray spectrum of hot astrophysical plasmas. By scanning a monoenergetic electron beam to resonantly excite trapped Fe ions in an electron beam ion trap and achieving a high electron-ion collision energy resolution of ∼7 eV, we resolve their respective KLn satellites up to n ′ = 11 . By normalization to known radiative recombination cross sections, we also determine their excitation cross sections and that of the continuum with uncertainties below 15% and verify our results with an independent normalization based on previous measurements. Our experimental data excellently confirm the accuracy and suitability of distorted-wave calculations obtained with the Flexible Atomic Code for modeling astrophysical and fusion plasmas.
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Fundação para a Ciência e a Tecnologia
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UI/BD/151000/2021