Beam-foil lifetime measurements in Fe v and Fe vi

Abstract

The authors have recorded beam-foil spectra of Fe v and Fe vi between 1100 and 1900 Å at ion energies ranging from 0.4 to 1.5 MeV. For the first time, lifetimes have been measured for thirteen $3d^{3}4p$ levels in Fe v and six $3d^{2}4p$ levels in Fe vi. These lifetime results are not in agreement with the available theoretical values deduced from the transition probabilities calculated by Abbott.