No abstract

A large-scale configuration interaction (CI) calculation using Program CIV3 of Hibbert is performed for the lowest 87 fine-structure levels of argon-like iron ions. We have calculated energy levels, oscillator strengths, and transition probabilities for all electric-dipole-allowed and intercombination transitions between the levels of 3s 3p 5 5d states of Fe ix in the LSJ coupling scheme. Lifetimes of the 3d levels are also determined. The calculations include the major correlation effects. We attempt to correct the inaccuracies in the CI coefficients in the wave functions, which would lead to inaccuracy in transition probabilities by applying a ''fine-tuning'' technique. The relativistic effects are incorporated by adding mass correction, Darwin term, and spin-orbit interaction terms to the nonrelativistic Hamiltonian in the Breit-Pauli approximations. The present results are in good agreement with other available calculations and experiments. We predict new data for several levels where no other theoretical or experimental results are available. We hope our extensive calculations will be useful to experimentalists in identifying the fine-structure levels in their future work.

Large-scale configuration interaction (CI) calculations are performed to evaluate the energy levels, oscillator strengths and transition probabilities for all the transitions in Co XI from ground-state level to those of 3s3p6, 3s23p43d, 3s23p44s and 3s23p44d states in LSJ coupling scheme. Lifetimes of the 3s3p6 and 3s23p43d levels are also determined. The calculations include the major correlation effects. We attempt to correct the inaccuracies in the CI coefficients in the wavefunctions, which would lead to inaccuracy in transition probabilities by applying a ‘fine-tuning’ technique. The relativistic effects are incorporated by adding mass correction, Darwin term and spin–orbit interaction terms to the non-relativistic Hamiltonian in the Breit–Pauli approximations. The calculated energy levels are in close agreement with the NIST results. We have predicted many new spectral lines, which are to be experimentally observed in the future.

We present accurate atomic structure calculations for the lowest 200 fine structural energy levels for oxygen-like nickel, which may be a useful ion for both astrophysical and fusion plasmas. For the calculations of energy levels and radiative rates, we have used the multiconfigurational Dirac–Fock method. Our results are compared with those obtained using other numerical methods and experiments so that their accuracy can be assessed. The transition wavelengths, oscillator strengths, and radiative rates are reported for electric dipole (E1) transitions from the ground state. We have also presented the transition probabilities and transition wavelength of some forbidden transitions. Finally, we predict new energy levels, oscillator strengths, and transition probability data, where no other theoretical or experimental results are available, which may be useful for future experimental work.

No abstract