FIELD: isotope technology. SUBSTANCE: ytterbium metal is heated to 750-1000 K. Metal vapors are consecutively affected by emission of three lasers: first at wavelength 551 ± 1 nm isotope atoms pass into excited state with energy 17992 cm-1; then at wavelength from 581.0770 to 581.0795 nm; and finally at 503, 528.5, 537, and 602.5 nm transition of excited atoms into autoionization state. EFFECT: significantly increased separation selectivity with regard to ytterbium-168 (up to 95-98%). 5 cl, 1 dwg, 1 ex
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