High-resolution triple-resonance autoionization of uranium isotopes |
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| Affiliation: | 1. Department of Physics, University of Karachi, Karachi-75270, Pakistan;2. Department of Physics, Islamia College Peshawar, Peshawar, Pakistan;3. Institute of Space Science and Technology (ISST), University of Karachi, Karachi-75270, Pakistan;4. Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria;1. Institute of Experimental Physics, University of Gdansk, ul. Wita Stwosza 57 PL-80-952 Gdansk, Poland;2. Physics Department, Faculty of Science, Istanbul University, Vezneciler, Tr-34134 Istanbul, Turkey;3. Institut für Experimentalphysik, Technische Universität Graz, Petersgasse 16, 8010 Graz, Austria;1. Department of Physics, University of Karachi, Karachi-75270, Pakistan;2. Department of Physics, Islamia College Peshawar, Peshawar, Pakistan;3. Institute of Space Science and Technology (ISST), University of Karachi, Karachi-75270, Pakistan;4. Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria |
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| Abstract: | The near-threshold autoionization (AI) spectrum of uranium has been investigated by triple-resonance excitation with single-mode continuous lasers. Spectra were recorded over the first ∼30 cm− 1 above the first ionization limit at a resolution of 3 × 10− 4 cm− 1 using intermediate states with different J values (6, 7, 8) to assign AI level total angular momentum JAI = 5 to 9. Resonances with widths ranging from 8 MHz to 30 GHz were observed; the strongest ones have JAI = 9 and widths of ∼60 MHz. Hyperfine structures for 235U and isotope shifts for 234,235U have been measured in the two intermediate levels and in the final AI level for the most favorable excitation path. These measurements were performed using aqueous samples containing sub-milligram quantities of uranium at natural isotopic abundances, indicating the potential of this approach for trace isotope ratio determinations. |
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