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Sökning: L773:0004 637X OR L773:1538 4357 > Mittuniversitetet

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1.
  • Ali, Safdar, et al. (författare)
  • Electron-ion recombination rate coefficients for C II forming C I
  • 2012
  • Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 753:2, s. 132-
  • Tidskriftsartikel (refereegranskat)abstract
    • We have determined absolute dielectronic recombination rate coefficients for C II, using the CRYRING heavy-ions storage ring. The resonances due to 2s-2p (∆n = 0) core excitations are detected in the center-of-mass energy range of 0-15 eV. The experimental results are compared with intermediate coupling AUTOSTRUCTURE calculations. Plasma rate coefficients are obtained from the DR spectrum by convoluting it with a Maxwell-Boltzmann energy distribution for temperatures in the range of 103-106 K. The derived temperature dependent plasma recombination rate coefficients are presented graphically to compare with the theoretical data available in literature and parameterized by using a fit formula for convenient use in plasma modelling codes. In the temperature range of 103-2×104 K, our experimental results show that previous calculations severely underestimate the plasma rate coefficients and also our AUTOSTRUCTURE calculation does not reproduce the experimental plasma rate coefficients well. Above 2×104 K the agreement between the experimental and theoretical rate coefficients is much better, and the deviations are smaller than the estimated uncertainties.
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2.
  • Mahmood, Sultan, et al. (författare)
  • RECOMBINATION RATE COEFFICIENTS OF BORON-LIKE Ne
  • 2013
  • Ingår i: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 771:2, s. 78-
  • Tidskriftsartikel (refereegranskat)abstract
    • Recombination of Ne5+ was measured in a merged-beam type experiment at the heavy-ion storage ring CRYRING. In the collision energy range 0-110 eV resonances due to 2s(2)2p -> 2s2p(2) (Delta n=0) and 2s(2)2p -> 2s(2)3l (Delta n=1), core excitations were observed. The experimentally derived rate coefficients agree well with the calculations obtained using AUTOSTRUCTURE. At low energies, recombination is dominated by resonances belonging to the spin-forbidden 2s2p(2)(P-4(J))nl series. The energy-dependent rate coefficients were convoluted with a Maxwell-Boltzmann electron energy distribution to obtain plasma recombination rate coefficients. The data from the literature deviate from the measured results at low temperature.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Schuch, Reinhold (2)
Ali, Safdar (2)
Orban, Istvan (2)
Glans, Peter (2)
Mahmood, Sultan, 196 ... (1)
Altun, Zikri (1)
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Altun, Z. (1)
Mahmood, Sultan (1)
Bleda, E. A. (1)
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Stockholms universitet (2)
Mittuniversitetet  (2)Ta bort avgränsningen
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Engelska (2)
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Naturvetenskap (2)

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