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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 orcid 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
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organization
publishing date
type
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
Oxford University Press
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
2016-04-01 10:18:27
date last changed
2023-01-02 03:20:04
@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}},
  keywords     = {{atomic data; methods: laboratory; techniques: spectroscopic; astronomical data bases: miscellaneous}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{1636--1639}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{The FERRUM project: metastable lifetimes in Cr II}},
  url          = {{https://lup.lub.lu.se/search/files/1732731/2970466.pdf}},
  doi          = {{10.1111/j.1365-2966.2011.20152.x}},
  volume       = {{420}},
  year         = {{2012}},
}