Journal
OPTICS EXPRESS
Volume 25, Issue 10, Pages 11477-11490Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.011477
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Funding
- U.S. Department of Energy (DOE) National Nuclear Security Administration (NNSA) Office of Defense Nuclear Nonproliferation and Verification Research and Development [NA-22]
- Consortium for Verification Technology under U.S. Department of Energy National Nuclear Security Administration Award [DE-NA0002534]
- U.S. Department of Homeland Security [2012.05 DN-130-NF0001]
- U.S. DOE [DE-AC05-76RLO1830]
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We report on the observation of uranium monoxide (UO) emission following fs laser ablation (LA) of a uranium metal sample. The formation and evolution of the molecular emission is studied under various ambient air pressures. Observation of UO emission spectra at a rarefied residual air pressure of similar to 1 Torr indicates that the UO molecule is readily formed in the expanding plasma with trace concentrations of oxygen present within the vacuum chamber. The persistence of the UO emission exceeded that of the atomic emission; however, the molecular emission was delayed in time compared to the atomic emission due to the necessary cooling and expansion of the plasma before the UO molecules can form. (C) 2017 Optical Society of America
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