RELATIVISTIC THEORETICAL CALCULATION OF O-III - RADIATIVE TRANSITION RATES AND THE BOWEN MECHANISM IN PLANETARY-NEBULAE

A full relativistic configuration interaction (RCI) calculation of tra nsition energies and radiative transition rates involved in O III Bowe n fluorescence mechanism is presented. The calculated ratios of transi tion are intensities are in good agreement with the observed ratios. T he discrepancies between the RCI calculation and prediction based on L S coupling scheme show that a delicate balance between the electron co rrelations and the spin-orbital interactions should be important even for the low-Z O III ion.