We present transition energies, probabilities and branching ratios for the
electric dipole allowed (E1) and forbidden (M1, E2, M2) lines of the 3s(2)3
p(4), 3s3p(5) and 3s(2)3p(3)3d configurations of Fe XI. Large-scale multico
nfiguration Dirac-Fock wavefunctions are applied to include the effects of
relativity, correlation and rearrangement of the electron density consisten
tly within the same (computational) model. From the transition probabilitie
s, lifetimes of the 46 lowest-lying excited levels are derived, and the pro
spects for experimental verification are discussed. An M2 transition is ide
ntified in the solar extreme ultraviolet spectrum.