Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012mnras.420.1636b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 2, pp. 1636-1639.
Astronomy and Astrophysics
Astronomy
Atomic Data, Methods: Laboratory, Techniques: Spectroscopic, Astronomical Data Bases: Miscellaneous
Scientific paper
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 τ5/2= 1.28(16) s and τ7/2= 1.37(7) s, respectively. A comparison with previous theoretical work shows good agreement and the result is discussed in a theoretical context.
Backstrom E.
Blackwell-Whitehead Richard
Gurell J.
Hartman Henrik
Mannervik Sven
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