Volume 396, Number 2, December III 2002
|Page(s)||715 - 722|
|Section||Catalogs and data|
|Published online||03 December 2002|
The FERRUM Project: Experimental oscillator strengths of the UV 8 multiplet and other UV transitions from the P levels of Fe II
Physics Department, Blackett Laboratory, Imperial College, London SW7 2BZ, UK
2 Department of Mathematics, Queen's University of Belfast, Northern Ireland
3 Atomic Astrophysics, Lund Observatory, Lund University, PO Box 43, SE-22100 Lund, Sweden
Corresponding author: J. Pickering, email@example.com
Accepted: 20 September 2002
We report on experimental branching fractions (BFs) for 19 transitions from the three 3d5(6S)4s4p(3P) y6P levels 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 Å. 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 Å in interstellar spectra. The line is accompanied by a satellite at 1611 Å due to a level mixing, which is discussed in the paper.
Key words: atomic data / line: identification / techniques: spectroscopic / stars: abundances / ISM: abundances
© ESO, 2002
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