Branching Fractions and Oscillator Strengths for Fe II Transitions from the 3d6(5D)4p Subconfiguration

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American Astronomical Society

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Bergeson, Scott D.; Mullman, K. L.; Wickliffe, M. E.; Lawler, J. E.
American Astronomical Society
atomic data; ISM; atoms; abundances; ultraviolet; Astrophysics and Astronomy
article description
New experimental branching fractions and transition probabilities are reported for 56 transitions in Fe II. The branching fractions are measured with a Fourier transform spectrometer and also with a high-resolution grating spectrometer on a n optically thin hollow cathode discharge. Highly accurate experimental radiative lifetimes from the recent literature provide the normalization required to convert our branching fractions into absolute transition probabilities. Results are compared with experimental and theoretical values in the literature. Our new transition probabilities will establish the absolute scale for relative absorption oscillator strengths of vacuum ultraviolet lines measured using a new high-sensitivity absorption experiment at the University of Wisconsin.