Recombination coefficients for the 5g - 4f transitions of O Iii at nebular temperatures and densities

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 \ion{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 5000 - 20 000 K and electron densities, N_e in the range 10(2-10^6) cm(-3) . All tables are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html