Relativistic magnetic quadrupole transitions in Be-like ions

The multiconfiguration Dirac-Fock method, based on the extended optimal level approximation, is used to calculate magnetic quadrupole transitions $\mathrm{}\left(M2\mathrm{}\right)\mathrm{}$ from ${2s2p(}^3{P}_2)$ to ${2s}^2{(}^1{S}_0)$ states in berylliumlike ions. The calculation of this transition for $Z>\mathrm{}6\mathrm{}$ uses the Dirac-Fock Hamiltonian which is necessary for highly ionized atoms. The Breit interaction is treated as a first-order perturbation, and its non-negligible contributions to the excitation energies for heavier ions are highlighted. Some of the $M2\mathrm{}$ transition probabilities results presented in this paper are calculated for the first time, to our knowledge.