Electron-impact excitation of O II fine-structure levels

R. Kisielius, P. J. Storey, G. J. Ferland, F. P. Keenan

Research output: Contribution to journalArticlepeer-review

87 Scopus citations


Effective collision strengths for forbidden transitions among the five energetically lowest fine-structure levels of O ii are calculated in the Breit-Pauli approximation using the R-matrix method. Results are presented for the electron temperature range 100-100 000 K. The accuracy of the calculations is evaluated via the use of different types of radial orbital sets and a different configuration expansion basis for the target wavefunctions. A detailed assessment of previous available data is given, and erroneous results are highlighted. Our results reconfirm the validity of the original Seaton and Osterbrock scaling for the optical O ii ratio, a matter of some recent controversy. Finally, we present plasma diagnostic diagrams using the best collision strengths and transition probabilities.

Original languageEnglish
Pages (from-to)903-912
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Aug 2009


  • Atomic data
  • Atomic processes
  • Line: formation
  • Planetary nebulae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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