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We calculate effective recombination coefficients for the formation of the 5g - 4f lines of O III in the intermediate coupling scheme. Photoionization data for the 5g levels calculated using the R-matrix method are used to derive their recombination coefficients. Cascading from higher states is included, allowing for the effects of finite electron density in a hydrogenic approximation. We explicitly include the distribution of population between the two ground levels of O 3+ in the calculation of the line intensities. The results are presented as a simple programmeable formula allowing the calculation of recombination line intensities for electron temperatures, T e in the range  K and electron densities, N e in the range  cm -3 .

Recombination coefficients for the 5g - 4f transitions of O$_{\mathrm{III}}$ at nebular temperatures and densities