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The FERRUM project :
The FERRUM project : Experimental lifetimes and transition probabilities from highly excited even 4d levels in Fe ii
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- Hartman, Henrik (författare)
- Malmö högskola,Institutionen för materialvetenskap och tillämpad matematik (MTM),Lund Observatory, Lund University
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- Nilsson, Hampus (författare)
- Lund Observatory, Lund University
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- Engström, L (författare)
- Department of Physics, Lund University
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- Lundberg, H (författare)
- Department of Physics, Lund University
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(creator_code:org_t)
- 2015-11-13
- 2015
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 584:A24
- Relaterad länk:
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https://doi.org/10.1...
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https://mau.diva-por... (primary) (Raw object)
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https://www.aanda.or...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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 laserproduced 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 di erence. 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.
Nyckelord
- atomic data methods
- laboratory
- atomic techniques
- spectroscopic
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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