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2009-01-01 - Article/Dans un journal avec peer-review - Anglais - 4 page(s)

Witthoeft M.C., Bautista M.A., Mendoza C., Kallman T.R., Palmeri Patrick , Quinet Pascal , "K-shell photoionization and photoabsorption of Ne, Mg, Si, S, Ar, and Ca" in Astrophysical Journal. Supplement Series, 182, 1, 127-130

  • Edition : Univ Chicago Press, Chicago (IL)
  • Codes CREF : Physique atomique et moléculaire (DI1220), Astrophysique (DI1455), Mécanique quantique classique et relativiste (DI1211)
  • Unités de recherche UMONS : Astrophysique et spectroscopie (S804)
Texte intégral :

Abstract(s) :

(Anglais) We present extensive computations of photoabsorption and photoionization cross sections across the K-edge of Ne, Mg, Si, S, Ar, and Ca ions with less than 11 electrons. The calculations are performed using the Breit-Pauli R-matrix method and include the effects of radiative and Auger damping by means of an optical potential. The wave functions are constructed from single-electron orbital bases obtained using a Thomas-Fermi-Dirac statistical model potential. Configuration interaction is considered among all fine-structure levels within the n = 2 complex. The damping processes affect the resonances converging to the K thresholds causing them to display symmetric profiles of constant width that smear the otherwise sharp edge at the photoionization thresholds.

Identifiants :
  • DOI : 10.1088/0067-0049/182/1/127