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Published April 2019 | Published + Accepted Version
Journal Article Open

Plasma environment effects on K lines of astrophysical interest. I. Atomic structure, radiative rates, and Auger widths of oxygen ions


Aims. In the context of black-hole accretion disks, the main goal of the present study is to estimate the plasma environment effects on the atomic structure and radiative parameters associated with the K-vacancy states in ions of the oxygen isonuclear sequence. Methods. We used a time-averaged Debye–Hückel potential for both the electron–nucleus and the electron–electron interactions implemented in the fully relativistic multiconfiguration Dirac–Fock (MCDF) method. Results. Modified ionization potentials, K thresholds, Auger widths, and radiative transition wavelengths and rates are reported for O I–O VII in plasma environments with electron temperature and density ranges 10^5−10^7 K and 10^(18)−10^(22) cm^(−3).

Additional Information

© 2019 ESO. Article published by EDP Sciences. Received 17 January 2019; Accepted 4 March 2019; Published online 12 April 2019. JD is a Research Fellow of the Belgian Fund for Research in Industry and Agriculture FRIA. PP & PQ are, respectively, Research Associate and Research Director of the Belgian Fund for Scientific Research F.R.S. –FNRS. Financial support from these organizations, as well as from the NASA Astrophysics Research and Analysis Program (grant 80NSSC17K0345) is gratefully acknowledged. We are indebted to Professor Nigel R. Badnell (Strathclyde University, UK) for lengthy and useful discussions on the validity of the Debye –Hückel potential and its implementations in atomic structure calculations. JAG acknowledges support from the Alexander von Humboldt Foundation.

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Published - aa35075-19.pdf

Accepted Version - 1903.04429.pdf


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August 19, 2023
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