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The FERRUM project: metastable lifetimes in Cr II

Backstrom, E.; Gurell, J.; Royen, P.; Mannervik, S.; Norlin, L.; Blackwell-Whitehead, Richard LU ; Hartman, Henrik LU and Nilsson, Hampus LU (2012) In Monthly Notices of the Royal Astronomical Society 420(2). p.1636-1639
Abstract
Parity forbidden radiative transitions from metastable levels are observed in spectra of low-density astrophysical plasmas. These lines are used as probes of the physical conditions, made possible due to the long lifetime of their upper level. In a joint effort, the FERRUM project aims to obtain new and accurate atomic data for the iron-group elements, and part of this project concerns forbidden lines. The radiative lifetimes of the metastable energy levels 3 d4(a 3 D)4 s c4 D 5/2 and 3 d4(a 3 D)4 s c4 D 7/2 of singly ionized chromium have been measured. The experiment has been performed at the ion storage ring CRYRING. We employed a laser-probing technique developed for measuring long lifetimes. In this article, we present the lifetimes... (More)
Parity forbidden radiative transitions from metastable levels are observed in spectra of low-density astrophysical plasmas. These lines are used as probes of the physical conditions, made possible due to the long lifetime of their upper level. In a joint effort, the FERRUM project aims to obtain new and accurate atomic data for the iron-group elements, and part of this project concerns forbidden lines. The radiative lifetimes of the metastable energy levels 3 d4(a 3 D)4 s c4 D 5/2 and 3 d4(a 3 D)4 s c4 D 7/2 of singly ionized chromium have been measured. The experiment has been performed at the ion storage ring CRYRING. We employed a laser-probing technique developed for measuring long lifetimes. In this article, we present the lifetimes of these levels to be t5/2= 1.28(16) s and t7/2= 1.37(7) s, respectively. A comparison with previous theoretical work shows good agreement and the result is discussed in a theoretical context. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
atomic data, methods: laboratory, techniques: spectroscopic, astronomical data bases: miscellaneous
in
Monthly Notices of the Royal Astronomical Society
volume
420
issue
2
pages
1636 - 1639
publisher
Wiley-Blackwell
external identifiers
  • wos:000299417600056
  • scopus:84856210787
ISSN
1365-2966
DOI
10.1111/j.1365-2966.2011.20152.x
language
English
LU publication?
yes
id
9a1bcdd9-4deb-45fb-af7d-d62772e1cc55 (old id 2416214)
date added to LUP
2012-03-28 10:12:32
date last changed
2017-09-17 03:31:58
@article{9a1bcdd9-4deb-45fb-af7d-d62772e1cc55,
  abstract     = {Parity forbidden radiative transitions from metastable levels are observed in spectra of low-density astrophysical plasmas. These lines are used as probes of the physical conditions, made possible due to the long lifetime of their upper level. In a joint effort, the FERRUM project aims to obtain new and accurate atomic data for the iron-group elements, and part of this project concerns forbidden lines. The radiative lifetimes of the metastable energy levels 3 d4(a 3 D)4 s c4 D 5/2 and 3 d4(a 3 D)4 s c4 D 7/2 of singly ionized chromium have been measured. The experiment has been performed at the ion storage ring CRYRING. We employed a laser-probing technique developed for measuring long lifetimes. In this article, we present the lifetimes of these levels to be t5/2= 1.28(16) s and t7/2= 1.37(7) s, respectively. A comparison with previous theoretical work shows good agreement and the result is discussed in a theoretical context.},
  author       = {Backstrom, E. and Gurell, J. and Royen, P. and Mannervik, S. and Norlin, L. and Blackwell-Whitehead, Richard and Hartman, Henrik and Nilsson, Hampus},
  issn         = {1365-2966},
  keyword      = {atomic data,methods: laboratory,techniques: spectroscopic,astronomical data bases: miscellaneous},
  language     = {eng},
  number       = {2},
  pages        = {1636--1639},
  publisher    = {Wiley-Blackwell},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {The FERRUM project: metastable lifetimes in Cr II},
  url          = {http://dx.doi.org/10.1111/j.1365-2966.2011.20152.x},
  volume       = {420},
  year         = {2012},
}