Abstract
An efficient method of identifying 235U iii (in natural-U samples), with the help of the optogalvanic effect in a hollow-cathode discharge, is presented. The use of this method enabled us to carry out the measurement of isotope shifts and the preliminary investigation of hyperfine structures of U iii. The 238U–235U shifts for the 591.313-, 586.045-, and 610.497-nm U iii lines are found to be 921(3), 417(6), and 392(12) mK, respectively.
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