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Issue 29, 2019

Physical conditions for UO formation in laser-produced uranium plumes

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Abstract

We investigate the oxidation of uranium (U) species, the physical conditions leading to uranium monoxide (UO) formation and the interplay between plume hydrodynamics and plasma chemistry in a laser-produced U plasma. Plasmas are produced by ablation of metallic U using nanosecond laser pulses. An ambient gas environment with varying oxygen partial pressures in 100 Torr inert Ar gas is used for controlling the plasma oxidation chemistry. Optical emission spectroscopic analysis of U atomic and monoxide species shows a reduction in the emission intensity and persistence with increasing oxygen partial pressure. Spectral modelling is used for identifying the physical conditions in the plasma that favor UO formation. The optimal temperature for UO formation is found to be in the temperature range of ∼1500–5000 K. The spectrally integrated and spectrally filtered (monochromatic) imaging of U atomic and molecular species reveals the evolutionary paths of various species in the plasma. Our results also highlight that oxidation in U plasmas predominantly occurs at the cooler periphery and is delayed with respect to plasma formation, and the dissipation of molecular species strongly depends on oxygen partial pressure.

Graphical abstract: Physical conditions for UO formation in laser-produced uranium plumes

Article information


Submitted
22 Apr 2019
Accepted
27 Jun 2019
First published
03 Jul 2019

Phys. Chem. Chem. Phys., 2019,21, 16161-16169
Article type
Paper
Author version available

Physical conditions for UO formation in laser-produced uranium plumes

S. S. Harilal, E. J. Kautz, B. E. Bernacki, M. C. Phillips, P. J. Skrodzki, M. Burger and I. Jovanovic, Phys. Chem. Chem. Phys., 2019, 21, 16161 DOI: 10.1039/C9CP02250C

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