Issue |
A&A
Volume 679, November 2023
|
|
---|---|---|
Article Number | A13 | |
Number of page(s) | 9 | |
Section | Atomic, molecular, and nuclear data | |
DOI | https://doi.org/10.1051/0004-6361/202347456 | |
Published online | 31 October 2023 |
Dielectronic recombination plasma rate coefficients of Na-, Mg-, and Al-like iron ions: The role of the 2(s + p) → 4l, nl′ and 3(s + p) → 5l, nl′ resonances
1
Helmholtz-Institut Jena,
Fröbelstieg 3,
07743
Jena, Germany
2
GSI Helmholtzzentrum für Schwerionenforschung,
Planckstrasse 1,
64291
Darmstadt, Germany
e-mail: g.visentin@hi-jena.gsi.de
3
Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen,
35392
Giessen, Germany
4
Helmholtz Forschungsakademie Hessen für FAIR,
Campus Giessen,
35392
Giessen, Germany
5
Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena,
07743
Jena, Germany
Received:
13
July
2023
Accepted:
22
August
2023
Dielectronic recombination (DR) is the major electron-ion recombination process in many astrophysical and laboratory plasmas. This process has been thoroughly studied for several charged species, in particular for M-shell iron ions. Previous investigations into the DR of such ions have mostly focused on the valence 3l → 3l, nl' and the core 2(s + p) → 3l, nl′ DR resonances, while neglecting the 2(s + p) → 4l, nl′ and 3(s + p) → 5l, nl′ DR resonances. These were predicted to contribute to the broad unresolved transition array detected in several active galactic nuclei at reasonably high temperatures and column densities. In this work, we systematically assessed the importance of 2(s + p) → 4l, nl′ and 3(s + p) → 5l, nl′ resonances in the DR of three M-shell iron ions, Fe15+, Fe14+, and Fe13+, with the multi-configuration Dirac-Hartree-Fock (MCDHF) method. Above the collisionally ionized plasma temperatures, these high-energy resonances contribute to the overall DR of Fe15+, Fe14+, and Fe13+ by up to 21%, 40%, and 22%, respectively.
Key words: atomic data / atomic processes / plasmas / relativistic processes
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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