We have used optical pumping to produce a substantial <sup>235</sup>U enrichment in the metastable levels of U I in the discharge afterglow of a hollow-cathode vapor generator. The measured isotope-enrichment factor for the level at 3800 cm<sup>−1</sup> is approximately 20.
© 1983 Optical Society of America
J. M. Gagné, Y. Demers, C. Drèze, and P. Pianarosa, "235U isotope enrichment in the metastable levels of U I," J. Opt. Soc. Am. 73, 498-499 (1983)