Abstract
Spectra of multiply charged oxygen ions were studied in the region between 1800 and 6000 Å by the beam foil method. The beam energy was 2, 4, 6 and 9 MeV for the charge state identification. Most of the intense lines are classified as transitions between high n, l levels in O III to O VIII, where n ranges from 9 to 15. The lines due to transitions 5l-6l' in Li-like O VI were investigated in detail in the 1800–2250 Å region. Many lines around 2070 Å were attributed to the transition of the type of 1s2s5l4L–1s2s6l' 4L' and 1s2p5l4L–1s2p6l' 4L', where L = l and L' = l'.
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