Abstract
The multiconfiguration Dirac-Fock method, based on the extended optimal level approximation, is used to calculate magnetic quadrupole transitions $(M2)$ from ${2s2p(}^{3}{P}_{2})$ to ${2s}^{2}{(}^{1}{S}_{0})$ states in berylliumlike ions. The calculation of this transition for $Zg6$ 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 $M2$ transition probabilities results presented in this paper are calculated for the first time, to our knowledge.
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