Electron correlation effects for doubly-excited states of Be-like Ar ¹⁴⁺ ion

The energies, radiative and Auger rates of the doubly excited states of Be-like Ar¹⁴⁺ ion are studied by using the multi-configuration- interaction method and model potential method. The doubly excited states of Be-like Ar¹⁴⁺ are labeled by the quantum numbers K, T and A to show the systematic regularity. The results show that the spectroscopy 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.