Oscillator strengths of allowed transitions for O III

The electric dipole oscillator strengths for lines in O III between some singlet and triplet levels have been calculated using the weakest bound electron potential model theory and the quantum defect orbital theory. In the calculations, both multiplet and fine-structure transitions are studied. The calculated oscillator strengths have been compared with available theoretical and experimental results. Good agreement with results in the literature has been obtained.

► Oxygen exists in the Earth’s atmosphere and its all ionization stages are required for the analysis of the spectra, radiative atomic quantities and various other applications. ► Oscillator strengths for lines between some singlet and triplet levels have been calculated using the weakest bound electron potential model theory and the quantum defect orbital. ► In the calculations, both multiplet and fine structure transitions are studied. ► We have employed both NCA and NRHF wave functions for expectation values of radii. ► A good agreement with the results in literature has been obtained.