Valence and L-shell photoionization of Cl-like argon using R-matrix techniques

N. B. Tyndall, C. A. Ramsbottom, C. P. Ballance, A. Hibbert

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Photoionization cross-sections are obtained using the relativistic DiracAtomic R-matrix Codes (DARC) for all valence and L-shell energy ranges between 27 and 270 eV. A total of 557 levels arising from the dominant configurations 3s23p4, 3s3p5, 3p6, 3s23p3[3d, 4s, 4p], 3p53d, 3s23p23d2, 3s3p43d, 3s3p33d2 and 2s22p53s23p5 have been included in the targetwavefunction representation of the Ar III ion, including up to 4p in the orbital basis. We also performed a smaller Breit-Pauli (BP) calculation containing the lowest 124 levels. Direct comparisons are made with previous theoretical and experimental work for both valence shell and L-shell photoionization. Excellent agreement was found for transitions involving the 2Po initial state to all allowed final states for both calculations across a range of photon energies. A number of resonant states have been identified to help analyse and explain the nature of the spectra at photon energies between 250 and 270 eV.

Original languageEnglish
Pages (from-to)366-373
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date14 Dec 2015
Publication statusPublished - 11 Feb 2016


  • Atomic data
  • Atomic processes
  • Methods: numerical
  • Scattering
  • Ultraviolet: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics


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