A total of 130 transitions in H-like, He-like, Li-like and Be-like oxygen have been observed in the wavelength region 7-32 nm using beam-foil excitation. A number of new lines are assigned to transitions in the doubly excited quartet system of O VI. The structure of this term system is derived from theoretical and experimental evidence. It is compared to the doubly excited term systems within the Li isoelectronic sequence.
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Hannebauer et al. (1978) studied this question.
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