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Galaxies 2018, 6(3), 74; https://doi.org/10.3390/galaxies6030074

Estimating the Level of Uncertainty in Electron-Impact Excitation and Photoionisation Rates of Low-Ionised Stages of Ni Ions

Centre of Theoretical Atomic, Molecular and Optical Physics, Queen’s University Belfast, University Road, Belfast BT7 1NN, Northern Ireland, UK
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Received: 26 June 2018 / Revised: 6 July 2018 / Accepted: 12 July 2018 / Published: 18 July 2018
(This article belongs to the Special Issue Atomic and Molecular Data Needs for Astronomy and Astrophysics)
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Abstract

Ni iv lines can be used as diagnostics for temperature and density for various astrophysical objects. In addition, ionization of Ni2+ is one of the causes of the opacity in the interstellar medium. We calculate the photoionization of Ni2+ and the electron-impact excitation of Ni3+. We use a fully-relativistic Dirac Atomic R-Matrix Code (DARC) method. We include a large set of configurations in the expansion of the wave functions of the target, up to the n=6 atomic shell. We show preliminary results for the photoionization cross-sections of Ni2+ and the electron-impact excitation collision strengths of Ni3+. The expected final results can be implemented in the available software packages for astrophysical plasma simulation, such as CLOUDY. We also show a preliminary estimation of the error of the data by the comparison of different sets of calculations. View Full-Text
Keywords: atomic data; opacity; photoionization; electron-impact excitation atomic data; opacity; photoionization; electron-impact excitation
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Fernández-Menchero, L.; Ramsbottom, C.A.; Ballance, C.P. Estimating the Level of Uncertainty in Electron-Impact Excitation and Photoionisation Rates of Low-Ionised Stages of Ni Ions. Galaxies 2018, 6, 74.

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