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Analysis of the quasicontinuum band emitted by highly ionised tungsten atoms in the 4–7 nm range

  • Teresa Isabel MadeiraEmail author
  • Pedro Amorim
  • Fernando Parente
  • Paul Indelicato
  • José Pires Marques
Regular Article

Abstract

Spectra emitted by highly ionized tungsten atoms from magnetically confined plasmas show a common feature: a narrow structured quasi-continuum emission band most prominent in the range 4−7 nm, which accounts for 40−80% of the radiated power. This band has been fairly well explained by unresolved transitions from groups 4d-4p, 4f-4d (Δn = 0) and 5d-4f, 5g-4f and 5p-4d (Δn = 1). In this work we use a Multi-Configuration Dirac-Fock code in Breit self-consistent field mode to compute level energies and transition probabilities for W27+ to W37+ ions contributing to this emission band. Intra-shell correlation was introduced in the calculation for both initial and final states and all dipole and quadrupole radiative transitions have been considered. The wavefunctions in the initial and final states are optimized separately and the resulting non-orthogonality effect is fully taken into account. The importance of some satellite lines was assessed. Together with the ionic distributions obtained by using the FLYCHK application and assuming that the initial states population depends statistically on the temperature we were able to synthesize plasma emission spectrum profiles for several electron temperatures.

Keywords

Atomic Physics 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Teresa Isabel Madeira
    • 1
    Email author
  • Pedro Amorim
    • 1
  • Fernando Parente
    • 2
  • Paul Indelicato
    • 3
  • José Pires Marques
    • 1
  1. 1.Centro de Física Atómica e Departamento de Física da Faculdade de Ciências da Universidade de LisboaLisboaPortugal
  2. 2.Centro de Física Atómica e Departamento de Física da Faculdade de Ciências e Tecnologia, Universidade Nova de LisboaCaparicaPortugal
  3. 3.Laboratoire Kastler Brossel, École Normale Supérieure, CNRS, Université Paris 6Paris Cedex 5France

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