Relativistic magnetic quadrupole transitions in Be-like ions - art. no. 042508

The multiconfiguration Dirac-Fock method, based on the extended optimal lev el approximation, is used to calculate magnetic quadrupole transitions (M2) from 2s2p(P-3(2)) to 2s(2)(S-1(0)) states in berylliumlike ions. The calcu lation of this transition for Z>6 uses the Dirac-Fock Hamiltonian which is necessary for highly ionized atoms. The Breit interaction is treated as a f irst-order perturbation, and;its non-negligible contributions to the excita tion energies for heavier ions are highlighted. Some of the M2 transition p robabilities results presented in this paper are calculated for the first t ime, to our knowledge.