Abstract
We report on experimental branching fractions (BFs) for 19 transitions from the three 3d 5 ( 6 S)4s4p( 3 P)y 6 Pl evels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 A. Absolute oscillator strengths (f -values) have been derived by combining the BFs with experimental radiative lifetimes recently reported in the literature. Theoretical f -values have been calculated using configuration interaction wavefunctions. The new experimental and theoretical f -values are compared with data available in the literature and in databases. The strongest lines measured belong to the UV 8 multiplet of Fe II, which has one ground state transition appearing as a prominent feature at 1608 A in interstellar spectra. The line is accompanied by a satellite at 1611 A due to a level mixing, which is discussed in the paper.
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