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The FERRUM project: Experimental lifetimes and transition probabilities from highly excited even 4d levels in Fe II

Hartman, Henrik LU ; Nilsson, Hampus LU ; Engström, Lars LU and Lundberg, Hans LU (2015) In Astronomy & Astrophysics 584.
Abstract
We report lifetime measurements of the 6 levels in the 3d(6)(5D)4d e(6)G 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 3d(6)(D-5)4p z(6)F levels at roughly half the energy difference. The f-values are obtained by combining the experimental lifetimes with branching fractions derived using relative intensities... (More)
We report lifetime measurements of the 6 levels in the 3d(6)(5D)4d e(6)G 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 3d(6)(D-5)4p z(6)F 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. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
keywords
atomic data, methods: laboratory: atomic, techniques: spectroscopic
in
Astronomy & Astrophysics
volume
584
publisher
EDP Sciences
external identifiers
  • wos:000366936800024
  • scopus:84947550247
ISSN
0004-6361
DOI
10.1051/0004-6361/201525738
language
English
LU publication?
yes
id
9bf40f7c-da61-4852-aabd-87d9dad3d2ad (old id 8545722)
date added to LUP
2016-01-29 11:57:12
date last changed
2017-09-17 05:48:37
@article{9bf40f7c-da61-4852-aabd-87d9dad3d2ad,
  abstract     = {We report lifetime measurements of the 6 levels in the 3d(6)(5D)4d e(6)G 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 3d(6)(D-5)4p z(6)F 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.},
  articleno    = {A24},
  author       = {Hartman, Henrik and Nilsson, Hampus and Engström, Lars and Lundberg, Hans},
  issn         = {0004-6361},
  keyword      = {atomic data,methods: laboratory: atomic,techniques: spectroscopic},
  language     = {eng},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {The FERRUM project: Experimental lifetimes and transition probabilities from highly excited even 4d levels in Fe II},
  url          = {http://dx.doi.org/10.1051/0004-6361/201525738},
  volume       = {584},
  year         = {2015},
}