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The two-colour three-step photoionisation technique has been used to obtain information on high-lying odd levels of U I in the energy region 34000-37000 cm -1 . One hundred and seventy eight new levels have been observed. Out of these, 27 levels have been assigned unique J values and 51 have an uncertainty of one unit in their J assignments. Uncertainties in J assignments for some of the levels reported in the literature have been removed.
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Mago et al. (1987) studied this question.
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