Level energies, oscillator strengths, and lifetimes for transitions in Ti VI

We present an extensive, ab initio configuration interaction calculation of oscillator strengths, transition probabilities, and lifetimes of the upper levels of all transitions in Ti VI between the levels of 3s23p5, 3s3p6, 3p43d, 3p44s, 3p44p and 3p44d states in the LSJ coupling scheme. Relativistic effects are incorporated by adding the mass correction, Darwin, and spin–orbit interaction terms to the non-relativistic Hamiltonian in the Breit–Pauli approximation. The calculations incorporate the major correlation effects. The calculated energy levels are in close agreement with most of the NIST tabulation. However, some discrepancies in the energy positions with experimental energies occur in levels with 3p43d 1D and 3P cores, particularly belonging to 2P and 2D symmetries. We predict new data for several levels where no other theoretical and/or experimental results are available. Our extensive calculations will be useful to experimentalists in identifying the fine-structure levels in their future work.