Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...569.1032w&link_type=abstract
The Astrophysical Journal, Volume 569, Issue 2, pp. 1032-1036.
Astronomy and Astrophysics
Astronomy
10
Atomic Data, Ism: Abundances, Methods: Laboratory, Ultraviolet: Ism
Scientific paper
We report a laboratory measurement of the oscillator strength, or f-value, for the far-ultraviolet Fe II resonance transition 3d6(5D)4sa6D9/2- 3d5(4G)4s4p(3Po)y6Fo11/2 at λvac=114.4938 nm. We restructured the High Sensitivity Absorption Spectroscopy experiment at the Synchrotron Radiation Center in Stoughton, WI, to extend its operating range, and measured the f-value for the Fe II 114.49 nm resonance transition relative to well-known reference f-values for two resonance transitions, 3d6(5D)4sa6D9/2- 3d5(4S)4s4p(3Po)y6Po7/2 at λvac=160.8451 nm and 3d6(5D)4sa6D9/2- 3d6(5D)4pz6Po7/2 at λvac=234.4214 nm. The Fe II 114.49 nm absorption f-value is 0.083+/-0.006, 20% to 30% smaller than f-values determined from astronomical observations. The accuracy of our measurement is the direct result of careful control and calibration of experimental parameters, cross-checked by measuring the relative f-values of our two reference lines.
Bonvallet G. A.
Lawler James E.
Wiese L. M.
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