Excitation energies and transition rates in the 3d(2) states of Ca-like ions - art. no. 032518

Energies, transition probabilities, and lifetimes are calculated for 3d(2) states in Ca-like ions with nuclear charges Z ranging from 22 to 100. Relat ivistic many-body perturbation theory (MBPT), including the Breit interacti on, is used to evaluate retarded M1 and E2 matrix elements. The calculation s start: from a 1s(2)2s(2)2p(6)3s(2)3p(6) Dirac-Fock potential. First-order perturbation theory is used to obtain intermediate coupling coefficients a nd second-order MBPT is used to determine matrix elements. Contributions fr om negative-energy states are included in the second-order M1 and E2 matrix elements. The resulting transition energies and lifetimes are compared wit h experimental values and with results from other recent calculations.