Empirical Verification of the FeiiOscillator Strengths in theFUSEBandpass

We report empirical determinations of atomic oscillator strengths, or f -values, for 11 ground-state transitions of Fe II in the wavelength range 1050 ≲ λ ≲ 1150 Å. We use ultraviolet absorption-line observations of interstellar material toward stars in the Galaxy and the Magellanic Clouds taken with Copernicus , the Goddard High Resolution Spectrograph on board the Hubble Space Telescope , and the Far-Ultraviolet Spectroscopic Explorer . We derive absolute oscillator strengths by a combination of the apparent optical depth, component-fitting, and curve-of-growth fitting techniques. Our derived oscillator strengths are generally in excellent agreement with recent theoretical calculations by Raassen & Uylings using the orthogonal operator technique. However, we identify three of the 11 transitions studied here whose f -values seem to be incompatible with these calculations by as much as a factor of 2. We suggest revisions to these f -values based on our analysis.