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Ionization balance for Ni ions under coronal equilibrium
선광일,박일흥,천병구,남육원,한원용 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.I
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.