Transitions in Co XI

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.