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2005-10-01 - Article/Dans un journal avec peer-review - Anglais - 7 page(s)

Palmeri Patrick , Froese Fischer C., Wyart J.-F., Godefroid M.R., "Oscillator strength calculations in neutral technetium" in Monthly Notices of the Royal Astronomical Society, 363, 2, 452-458

  • Edition : Blackwell Publishing, Oxford (United Kingdom)
  • Codes CREF : Enseignement des sciences exactes et naturelles (DI0131), Mécanique quantique classique et relativiste (DI1211)
  • Unités de recherche UMONS : Astrophysique et spectroscopie (S804)
Texte intégral :

Abstract(s) :

(Anglais) Ab initio multiconfiguration calculations are performed for the oscillator strengths of the A = 4238, 4262 and 4297 Å Tc i resonance lines of astrophysical interest. Electron correlation is treated through multiconfiguration expansions built from elaborate correlation models, while relativistic effects are introduced in the perturbation Breit-Pauli approximation or in the multiconfiguration Dirac-Fock-Breit variational approach. The calculated gf-values are sensitively lower (30 per cent) than the values obtained with the pseudo-relativistic Hartree-Fock wavefunctions calculated from a parametric analysis of Tc I by Palmeri & Wyart. The inclusion of a core-polarization potential in the latter approach confirms the present ab initio results when different ionic cores are used for the different transition arrays. The strong lines of Tc I are revisited adopting this model, giving rise to a systematic reduction in the oscillator strength scale due to core polarization. The astrophysical implications are discussed.

Identifiants :
  • DOI : 10.1111/j.1365-2966.2005.09410.x