Collision strengths for nebular [O III] optical and infrared lines

P. J. Storey, Taha Sochi, N. R. Badnell

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We present electron collision strengths and their thermally averaged values for the nebular forbidden lines of the astronomically abundant doubly ionized oxygen ion, O2+, in an intermediate coupling scheme using the Breit–Pauli relativistic terms as implemented in an R-matrix atomic scattering code. We use several atomic targets for the R-matrix scattering calculations including one with 72 atomic terms. We also compare with new results obtained using the intermediate coupling frame transformation method. We find spectroscopically significant differences against a recent Breit–Pauli calculation for the excitation of the [O iii] λ4363 transition but confirm the results of earlier calculations.
Original languageEnglish
Pages (from-to)3028-3039
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date28 May 2014
Publication statusPublished - 11 Jul 2014


  • atomic data
  • atomic processes
  • non-thermal radiation mechanisms
  • planetary nebulae
  • infrared


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