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

Storey, P. J. and Sochi, Taha and Badnell, N. R. (2014) Collision strengths for nebular [O III] optical and infrared lines. Monthly Notices of the Royal Astronomical Society, 441 (1). pp. 3028-3039. ISSN 0035-8711

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    Abstract

    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.