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.
@article{arxiv.1001.2139,
title = {The FERRUM project: laboratory-measured transition probabilities for Cr II},
author = {J. Gurell and H. Nilsson and L. Engstrom and H. Lundberg and R. Blackwell-Whitehead and K. E. Nielsen and S. Mannervik},
journal= {arXiv preprint arXiv:1001.2139},
year = {2015}
}