Spectra of the ionized oxygen atoms were studied by pro-500i monochromator equipped with CCD.The beam foil method was used with 2 MeV oxygen ion beams.In this paper
we report 182 spectral lines determined in the 350-450 nm region.Most of the spectral lines were attributed to n
1 energy level transitions from OII to OIV atoms.The experimental results are in good agreement with available theoretical results.The 28 lines were found for the first time
and a majority of the spectral lines attribute to week transitional lines.