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The FERRUM project: Experimental transition probabilities from highly excited even 5s levels in Cr II

Engström, Lars LU ; Lundberg, Hans LU ; Nilsson, Hampus LU ; Hartman, Henrik LU and Backstrom, E. (2014) In Astronomy & Astrophysics 570.
Abstract
We report lifetime measurements of the five levels in the 3d(4)(a(5)D)5s e(6)D 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 3d(4)(a(5)D)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 lamp recorded with a Fourier... (More)
We report lifetime measurements of the five levels in the 3d(4)(a(5)D)5s e(6)D 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 3d(4)(a(5)D)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 lamp recorded with a Fourier transform spectrometer. (Less)
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author
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
570
publisher
EDP Sciences
external identifiers
  • wos:000344158500140
  • scopus:84907967227
ISSN
0004-6361
DOI
10.1051/0004-6361/201424762
language
English
LU publication?
yes
id
71e3f23b-53c9-4065-8be0-e687f6cf9f55 (old id 4875700)
date added to LUP
2014-12-30 10:26:32
date last changed
2017-11-19 03:58:08
@article{71e3f23b-53c9-4065-8be0-e687f6cf9f55,
  abstract     = {We report lifetime measurements of the five levels in the 3d(4)(a(5)D)5s e(6)D 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 3d(4)(a(5)D)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 lamp recorded with a Fourier transform spectrometer.},
  articleno    = {A34},
  author       = {Engström, Lars and Lundberg, Hans and Nilsson, Hampus and Hartman, Henrik and Backstrom, E.},
  issn         = {0004-6361},
  keyword      = {atomic data,methods: laboratory: atomic,techniques: spectroscopic},
  language     = {eng},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {The FERRUM project: Experimental transition probabilities from highly excited even 5s levels in Cr II},
  url          = {http://dx.doi.org/10.1051/0004-6361/201424762},
  volume       = {570},
  year         = {2014},
}