New atomic data for Ti X

Abstract

A large-scale configuration interaction (CI) calculation using CIV3 is performed for the 303 fine-structure levels of the aluminum-like titanium ion. We have calculated the energy levels, oscillator strengths, and transition probabilities for the electric dipole allowed and intercombination transitions among the levels of ground state 3s 23p ( 2p o) and higher energy levels of states 3s3p 2, 3p 3, 3s3p3d, 3p 23d, 3s 24s, 3s3d 2, 3s 24p, 3s3p4s, 3s3p4p, 3p3d 2, 3s3p4d, 3s3p4f, 3s 25p, 3p 24p, 3s3d4s, 3s3p5s, 3s3d4p, 3s3p5p, 3s 2(4d, 4f, 5s, 5d, 5f, 6s, 6p, 6d, 6f) of Ti X in the LSJ coupling scheme. The calculations include all the major correlation effects. We attempt to correct the inaccuracies in the CI coefficients in the wavefunctions, which would lead to inaccuracies in transition probabilities by applying a “fine-tuning” technique. The relativistic effects are incorporated by adding the mass correction, Darwin, and spin–orbit interaction terms into the non-relativistic Hamiltonian in the Breit–Pauli approximation. The present results are in good agreement with other available calculations and experiments. Several new lines corresponding to 3s3p nl ( n = 4, 5 and l = 0, 1), 3s 25p, 3s 2(6s, 6p) and other configurations are predicted where no other theoretical or experimental results are available. We expect that our extensive calculations will be useful to experimentalists in identifying the fine-structure levels in their future work.