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Issue A&A
Volume 445, Number 3, January III 2006
Page(s) 1165 - 1168
Section Atomic, molecular and nuclear data
DOI http://dx.doi.org/10.1051/0004-6361:20054152



A&A 445, 1165-1168 (2006)
DOI: 10.1051/0004-6361:20054152

The FERRUM project: improved experimental oscillator strengths in Cr II

H. Nilsson1, G. Ljung1, H. Lundberg2 and K. E. Nielsen3, 4

1  Atomic Astrophysics, Lund Observatory, Lund University, Box 43, 221 00 Lund, Sweden
2  Atomic Physics, Department of Physics, Lund Institute of Technology, Box 118, 221 00 Lund, Sweden
3  Catholic University of America, Washington, DC 20064, USA
4  Exploration of the Universe Division, Code 667, Goddard Space Flight Center, Greenbelt, MD 20771, USA

(Received 5 September 2005 / Accepted 14 September 2005 )

Abstract
We report absolute oscillator strengths for 119 $\ion{Cr}{ii}$ transitions in the wavelength region 2050-4850 Å. The transition probabilities have been derived by combining radiative lifetimes, measured with time-resolved laser induced fluorescence, and branching fractions from intensity calibrated Fouirer transform spectrometer data. New radiative lifetimes for the 3d4(5D)4p 4F, 4D and 6P terms are reported, adding up to a total of 25 energy levels with measured lifetimes used to derive this improved set of atomic data.


Key words: atomic data -- line: identification

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