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

Storey, P. J. (1); Sochi, Taha (1); Badnell, N. R. (2)

(1) Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK; (2) Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK.

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.

Complete paper ==> http://adsabs.harvard.edu/abs/2014MNRAS.441.3028S

 

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