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