Abstract
Configuration interaction wavefunctions obtained using the CIV3 code are used to calculate energy levels and oscillator strengths for all significant electric dipole (E1), electric quadrupole (E2), magnetic dipole (M1) and magnetic quadrupole (M2) transitions among the seventeen 1s2, 1s2l and 1s3l states of He-like Ni XXVII. Accurate wavefunctions are also obtained using the fully relativistic multi-configurational Dirac-Fock (MCDF) method and similarly employed to calculate energy levels and oscillator strengths. The derived energy levels are compared to each other and also with previous results, and indicate that the MCDF method gives data which are closer to the experimental energies. Calculated CIV3 and MCDF A-values are found to be in good agreement but to differ significantly in some cases from those of previous authors.
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