Multi-configuration Dirac–Fock calculations for multi-valence-electron systems: Benchmarks for Zn-like ions

We report on a extensive calculation of the 4s2–4s4p transitions in the zinc-like sequence, using the multi-configuration Dirac–Fock method. Results for fine-structure energy levels, the wavelengths, and transition rates between Z = 55 (Cs) and Z = 69 (Tm) are presented and compared with results from other theories and experiments. The calculated values including core–valence correlation are found to be similar and to compare very well with values from other theories and experiments. We believe that our extensive calculated values can guide experimentalists in identifying the fine-structure levels in their future work.