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The spectra from Fe-peak elements may be used to determine the temperatureand density of various astrophysical objects. Determination of these quantitiesis underpinned by the accuracy and the comprehensiveness of the underlyingatomic structure and collisional calculations. In the following paper, we shallfocus specifically on Ni IV lines associated with transitions amongst severallow-lying levels. We shall employ modified versions of the parallel DiracR-matrix codes, considering both electron-impact excitation of Ni$^{3+}$ andthe photoionisation of both the ground and excited states of Ni$^{2+}$. Weproduce high-quality data sets for both processes, and using these data, wecalculate line ratios relevant for plasma diagnostics of temperature anddensity.

Spectroscopic diagnostics of low-ionized iron-peak elements. Electron-impact excitation of Ni$^{3+}$ and photoionisation of Ni$^{2+}$