The FERRUM project: laboratory-measured transition probabilities for Cr II

Details The FERRUM project: laboratory-measured transition probabilities for Cr II The FERRUM project: laboratory-measured transition probabilities for Cr II

2010-01-13

arxiv.org/abs/1001.2139v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages. Accepted for publication in A&A

Scientific paper

Aims: We measure transition probabilities for Cr II transitions from the z ^4H_J, z ^2D_J, y ^4F_J, and y ^4G_J levels in the energy range 63000 to 68000 cm^{-1}. Methods: Radiative lifetimes were measured using time-resolved laser-induced fluorescence from a laser-produced plasma. In addition, branching fractions were determined from intensity-calibrated spectra recorded with a UV Fourier transform spectrometer. The branching fractions and radiative lifetimes were combined to yield accurate transition probabilities and oscillator strengths. Results: We present laboratory measured transition probabilities for 145 Cr II lines and radiative lifetimes for 14 Cr II levels. The laboratory-measured transition probabilities are compared to the values from semi-empirical calculations and laboratory measurements in the literature.

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