Properties of the Kα X-ray transitions in highly ionized cobalt

Multi-Configuration Dirac-Fock and relativistic configuration interaction calculations with the inclusion of the Breit interaction, quantum electrodynamics and finite nuclear mass corrections have been carried out in the extended optimal level (EOL) scheme on the transition wavelengths, transition probabilities, absorption oscillator strengths and line strengths of the Kα X-ray from Co XIIX to Co XXVI. The calculated values are compared with the other available data on He-like to Be-like cobalt and are found to be in very good agreement with them. This confirms the present calculations. These data provide reference values for level lifetimes, charge state distribution and average charge of cobalt plasmas.