Radiative lifetimes for seven levels of the z ${}_{}{}^4{}_{}{}^{}\mathrm{°}$, ${}_{}{}^4{}_{}{}^{}$D°, and ${}_{}{}^4{}_{}{}^{}$F° terms of Fe ii have been measured by using laser excitation of a beam of fast ${\mathrm{Fe}}^{+}$ ions. The ratio of the measured lifetime to that calculated from Kurucz’s gf values appears to increase systematically with the energy of the levels involved.

• Received 21 February 1992

DOI:https://doi.org/10.1103/PhysRevA.46.641