Volume 584, December 2015
|Number of page(s)||6|
|Section||Atomic, molecular, and nuclear data|
|Published online||13 November 2015|
The FERRUM project: Experimental lifetimes and transition probabilities from highly excited even 4d levels in Fe ii
1 Material Sciences and Applied Mathematics, Malmö University, 20506 Malmö, Sweden
2 Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden
3 Department of Physics, Lund University, Box 118, 22100 Lund, Sweden
Received: 23 January 2015
Accepted: 25 August 2015
We report lifetime measurements of the 6 levels in the 3d6(5D)4d e6G term in Fe ii at an energy of 10.4 eV, and f-values for 14 transitions from the investigated levels. The lifetimes were measured using time-resolved laser-induced fluorescence on ions in a laser-produced plasma. The high excitation energy, and the fact that the levels have the same parity as the the low-lying states directly populated in the plasma, necessitated the use of a two-photon excitation scheme. The probability for this process is greatly enhanced by the presence of the 3d6(5D)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 discharge lamp recorded with a Fourier transform spectrometer. The data is important for benchmarking atomic calculations of astrophysically important quantities and useful for spectroscopy of hot stars.
Key words: atomic data / methods: laboratory: atomic / techniques: spectroscopic
© ESO, 2015
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