Two-colour resonance ionization spectroscopy was used for identification of 240 new levels of '"U in the energy range of 38 500 to 41 200 cm-'. A precision of +0.03 Em-' (1 SD) for the energies was obtained by using laser-induced fluorescence signals of I, for speclral calibration. The angular momentum quantum number, J, was uniquely assigned for 134 of these levels by using angular momentum selection rules.
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