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Träfflista för sökning "WFRF:(Litzén U) "

Search: WFRF:(Litzén U)

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  • Brault, JW, et al. (author)
  • Structure and line strengths in extreme jK coupling: an experimental and theoretical study in Ni ii
  • 1983
  • In: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 28:4, s. 475-475
  • Journal article (peer-reviewed)abstract
    • The spectrum emitted from a nickel hollow cathode has been recorded with a Fourier transform spectrometer. Two dense groups of lines just above 18 000 Å have been identified as the transitions 3d8 (3F)5f-3d8 (3F)6g and 3d8 (3F)5g-3d8 (3F)6h in Ni II. The level structure of the configurations involved in these transitions has been studied by fitting the Slater parameters of the energy matrices to the observations. The fitted parameters have been used for calculating the relative line strengths in the transition arrays. Comparisons with the observed intensities show very good agreement.
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  • Cogordan, JA, et al. (author)
  • Relativistic calculation of 2p53s, 3p and 3d energy levels and transition wavelengths in Ti XIII, Fe XVII and some other neon-like ions
  • 1985
  • In: Physica Scripta. - 0031-8949. ; 31:6, s. 545-550
  • Journal article (peer-reviewed)abstract
    • Average energies for the configurations 2p5 3s, 3p and 3d in a number of neon-like ions from Al IV to Xe XLV have been calculated by means of the MCDF computer code of Grant et al. The results have been compared with observations and previous non-relativistic calculations. Fine- structure levels and 3s-3p and ip-3d transition wavelengths have also been calculated with the MCDF code for Ti XIII and Fe XVII, both in the single-configuration approximation and in a multiconfiguration treatment including 2s 2p6 nl. The configuration interaction was found to affect 2p5 3p3S1 most seriously. A separate optimization for the 3p1S0 state was needed, due to the particular radial dependence of this state. The calculated wavelengths show excellent agreement with the observations, and the MCDF calculations are well suited for wavelength predictions in neon-like n = 3 systems
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  • Ekberg, JO, et al. (author)
  • Accurate experimental lifetimes of excited levels in sodiumlike sulfur, S VI
  • 1983
  • In: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 27:6, s. 425-425
  • Journal article (peer-reviewed)abstract
    • The lifetimes of the terms 3p2P, 3d2D, 4s2S, 4p2P, 4d2D, 4f2F, 5g2G, 6g2G, 6h2H, 7h2H, 7i2I and 8k2K in sodiumlike sulfur, S VI, have been determined using the beam-foil excitation technique. Most of the decay curves were analyzed by means of the ANDC method which corrects for cascading in a very detailed way. Accurate results were thereby obtained which show that an excellent agreement exists between experimental and theoretical values. Some previously noted disagreements between the results of beam-foil experiments and theoretical investigations are explained as being due to less accurate analyses of the experimental data.
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  • Result 1-10 of 23

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