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Träfflista för sökning "WFRF:(Johanning S) srt2:(2000-2004)"

Search: WFRF:(Johanning S) > (2000-2004)

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1.
  • Johansson, Sveneric, et al. (author)
  • The FERRUM Project: New f-value Data for Fe II and Astrophysical Applications
  • 2002
  • In: Physica Scripta. - : Institute of Physics Publishing (IOPP). - 0281-1847 .- 0031-8949 .- 1402-4896. ; T100, s. 71-80
  • Conference paper (peer-reviewed)abstract
    • We present the FERRUM Project, an international collaboration aiming at a production and evaluation of oscillator strengths (transition probabilities) of selected spectral lines of singly ionized iron group elements, that are of astrophysical relevance. The results obtained include measurements and calculations of permitted and forbidden lines of Fe II. The data have been applied to both emission and absorption lines in astrophysical spectra. We make comparisons between experimental, theoretical and astrophysical f-values. We give a general review of the various measurements, and discuss the UV8 multiplet of Fe II around 1610 Šin detail.
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2.
  • Schultz-Johanning, M, et al. (author)
  • Lifetimes, branching fractions, and oscillator strengths of doubly ionized Tungsten
  • 2001
  • In: Physica Scripta. Topical Issues. - 0281-1847. ; 63:5, s. 367-371
  • Journal article (peer-reviewed)abstract
    • A first small set of W III oscillator strengths has been obtained from combined lifetime and branching fraction measurements. The branching fractions in the wavelength region of 154-334 nm were measured with a Penning discharge and a Fourier transform spectrometer. Three levels have been calibrated on absolute scales with lifetimes measured with the time-resolved laser-induced fluorescence technique. The f-values derived have uncertainties of about 8% at best. A comparison with Cowan-code calculations is given since no other data are available in the literature.
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