High-Resolution Triple Resonance Autoionization of Uranium Isotopes
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 {approx}30 cm-1 above the first ionization limit at a resolution of 3x10-4 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 {approx} 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.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 876912
- Report Number(s):
- PNNL-SA-44825; KC0302020; TRN: US0601528
- Journal Information:
- Spectrochimica Acta. Part B, Atomic Spectroscopy, Vol. 60, Issue 11
- Country of Publication:
- United States
- Language:
- English
Similar Records
Triple-Resonance Autoionization of Uranium Optimized for Diode Laser Excitation
Three-photon resonance ionization of atomic Mn in a hot-cavity laser ion source using Ti:sapphire lasers