Energies and transition rates for the doubly-excited states of Be-like Ar¹⁴⁺ ion

The energies, radiative and Auger rates of the doubly excited states of Be-like Ar¹⁴⁺ ion are studied using the multi-configuration-interaction method and the model potential method. The doubly excited states of Be-like Ar¹⁴⁺, He-like S¹⁴⁺ and Ar¹⁶⁺ ions are labeled by the quantum numbers K, T and A to show the systematic regularity. The results show that the spectroscopy of these states of Be-like ions is different from that of He-like ions because of the polarization and core penetration effects from the 1s² core electrons.