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We report lifetime measurements of the 6 levels in the 3d6(5D)4d e6G term inFe ii at an energy of 10.4 eV, and f -values for 14 transitions from theinvestigated levels. The lifetimes were measured using time-resolvedlaser-induced fluorescence on ions in a laser-produced plasma. The highexcitation energy, and the fact that the levels have the same parity as the thelow-lying states directly populated in the plasma, necessitated the use of atwo-photon excitation scheme. The probability for this process is greatlyenhanced by the presence of the 3d6(5D)4p z6F levels at roughly half the energydifference. The f -values are obtained by combining the experimental lifetimeswith branching fractions derived using relative intensities from a hollowcathode discharge lamp recorded with a Fourier transform spectrometer. The datais important for benchmarking atomic calculations of astrophysically importantquantities and useful for spectroscopy of hot stars.

The FERRUM project: Experimental lifetimes and transition probabilities from highly excited even 4d levels in Fe ii