Fine-structure in 3d4 states of highly charged Ti-like ions

A remarkable improvement of ab initio calculations was obtained for wavelengths of (3d(4)) J = 3 --> 2 forbidden transition. Present calculations reduced the long-standing discrepancy from measurements down to less than 0.2% for most high-Z titanium-like ions. In the present calculations, a large extent of configuration space was included so that most important many-body effects were taken into account. To this end, the linearized second-order Brillouin-Wigner perturbation theory was employed with optimized spin-orbitals. Transition probability and atomic g-factor were also calculated with the improved atomic wavefunctions.