The available electron-impact ionization cross-sections and recombination rate coefficients for Ni
ions are reviewed, and the fit parameters to Younger's empirical formula for the ionization crosssections
of Ni1+, Ni3+, and Ni5+ through Ni8+ are updat...
The available electron-impact ionization cross-sections and recombination rate coefficients for Ni
ions are reviewed, and the fit parameters to Younger's empirical formula for the ionization crosssections
of Ni1+, Ni3+, and Ni5+ through Ni8+ are updated. Also presented are the calculations
of the ionization balance for the ions under coronal equilibrium. The calculated ionic abundance
fractions are compared with those of previous work. A possible implication of the long-standing
problem of Nickel overabundances in several classes of astronomical objects is also discussed.