Volume 570, October 2014
|Number of page(s)||5|
|Section||Atomic, molecular, and nuclear data|
|Published online||10 October 2014|
The FERRUM project: Experimental transition probabilities from highly excited even 5s levels in Cr ii
1 Department of Physics, Lund University, Box 118, 22100 Lund, Sweden
2 Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden
3 Applied Mathematics and Material Science, Malmö University, 20506 Malmö, Sweden
4 Department of Physics, Stockholm University, AlbaNova University Center, 106 91 Stockholm, Sweden
Received: 6 August 2014
Accepted: 1 September 2014
We report lifetime measurements of the five levels in the 3d4(a5D)5s e6D term in Cr ii at an energy around 83 000 cm-1, and log(gf) values for 38 transitions from the investigated levels. The lifetimes are obtained using time-resolved, laser-induced fluorescence on ions from a laser-produced plasma. Since the levels have the same parity as the low-lying states directly populated in the plasma, we used a two-photon excitation scheme. This process is greatly facilitated by the presence of the 3d4(a5D)4p z6F levels at roughly half the energy difference. The f-values are obtained by combining the experimental lifetimes with branching fractions derived using relative intensities from a hollow cathode lamp recorded with a Fourier transform spectrometer.
Key words: atomic data / methods: laboratory: atomic / techniques: spectroscopic
© ESO, 2014
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