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

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    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.



    Original languageEnglish
    Article number74
    Number of pages7
    Journal publication date18 Jul 2018
    Issue number3
    Publication statusPublished - 18 Jul 2018
    EventEuropean Week of Astronomy and Space Science (EWASS) - Arena & Convention Centre (ACC), Liverpool, United Kingdom
    Duration: 03 Apr 201806 Apr 2018

      Research areas

    • ATOMIC DATA, Opacities, Photoionization, ELECTRON-IMPACT EXCITATION

    ID: 157555595