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
Author to whom correspondence should be addressed.
Received: 26 June 2018 / Revised: 6 July 2018 / Accepted: 12 July 2018 / Published: 18 July 2018
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lines can be used as diagnostics for temperature and density for various astrophysical objects. In addition, ionization of
is one of the causes of the opacity in the interstellar medium. We calculate the photoionization of
and the electron-impact excitation of
. 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
atomic shell. We show preliminary results for the photoionization cross-sections of
and the electron-impact excitation collision strengths of
. 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.
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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.
Fernández-Menchero L, Ramsbottom CA, Ballance CP. Estimating the Level of Uncertainty in Electron-Impact Excitation and Photoionisation Rates of Low-Ionised Stages of Ni Ions. Galaxies. 2018; 6(3):74.
Fernández-Menchero, Luis; Ramsbottom, Catherine A.; Ballance, Connor P. 2018. "Estimating the Level of Uncertainty in Electron-Impact Excitation and Photoionisation Rates of Low-Ionised Stages of Ni Ions." Galaxies 6, no. 3: 74.
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