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J. M. Gagné, S. Nguyen Van, J. P. Saint-Dizier and P. Pianarosa Journal of the Optical Society of America 66(12) 1415 (1976) https://doi.org/10.1364/JOSA.66.001415
Uranium transitions and energy levels which may be useful in atomic-photoionization schemes for separating 238U and 235U