Decay processes of the core-excited states 1s2s2p² for Be-like systems

Energies, radiative decay rates and Auger decay probabilities of the core-excited states 1s2s2p² of Be-like ions are studied using the fully relativistic MCDF method. Electron correlations effects are considered using the active space method in extended optimal level mode. Variations of radiative and Auger rates as a function of Z are studied. Results show that radiative rates increase smoothly with increasing Z in the Z space from 8 to 28. At low Z, Auger rates are greater than radiative probabilities, while at Z=28, for most of the states, radiative probabilities exceed the Auger rates.