The FERRUM project: metastable lifetimes in Cr II
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2416214
- author
- Backstrom, E. ; Gurell, J. ; Royen, P. ; Mannervik, S. ; Norlin, L. ; Blackwell-Whitehead, Richard LU ; Hartman, Henrik LU and Nilsson, Hampus LU
- organization
- publishing date
- 2012
- 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
- 2024-01-06 13:26:39
@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}}, }