Branching ratios and lifetimes for the low-lying levels of Fe x

Transition energies, probabilities and branching ratios for electric dipole allowed (El) and forbidden (M1, E2, M2) lines have been calculated for the 3s(2)3p(5), 3s3p(6) and 3s(2)3p(4)3d configurations of Fe x. From the tran sition probabilities, lifetimes of all 31 levels of these low-lying configu rations are also derived, and compared with experiment. By applying systema tically enlarged multiconfiguration Dirac-Fock wavefunctions, most importan t effects of relativity, correlation and the rearrangement of the electron density are treated within the same (computational) model.