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The FERRUM project: metastable lifetimes in Cr II

In English

Författare

Summary, in English

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.

Publiceringsår

2012

Språk

Engelska

Sidor

1636-1639

Publikation/Tidskrift/Serie

Monthly Notices of the Royal Astronomical Society

Volym

420

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Astronomy, Astrophysics and Cosmology

Nyckelord

  • atomic data
  • methods: laboratory
  • techniques: spectroscopic
  • astronomical data bases: miscellaneous

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1365-2966