Abstract

The transition energies, wavelengths and oscillator strengths for the 1s22s-1s2np (n ⩽ 9) transitions of Ni25+ ion are calculated. In calculation of the energies, we not only take account of the firstorder corrections from relativistic and mass-polarization effects, but also estimate the higher-order relativistic contribution and QED correction by introducing the effective nuclear charge. The results agree with experimental data available in literature satisfactorily. Grotrian diagram showing these transitions is given.

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