Energy levels and oscillator strengths for transitions in helium-like Fe XXV and Ni XXVII.
Abstract
Configuration interaction (CI) wavefunctions 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 1s2, 1s2l and 1s3l states of He-like Fe XXV and Ni XXVII. Accurate wavefunctions are also obtained using the fully relativistic MCDF method and similarly employed to calculate these same energy levels and oscillator strenths. Derived energy levels are compared to each other and with previous results, and indicate that the MCDF method gives data which are closer to the experimental energies. The calculated CI and MCDF A-values are found to be in good agreement, but differ significantly in some cases from these and previous authors.
- Publication:
-
UV and X-ray Spectroscopy of Laboratory and Astrophysical Plasmas
- Pub Date:
- 1993
- Bibcode:
- 1993uxrs.conf..122H
- Keywords:
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- Oscillator Strengths: Iron;
- Oscillator Strengths: Nickel