Benefits of using multiple Raman laser wavelengths for characterizing defects in a UO ₂ matrix

Raman spectroscopy is one of the most useful techniques for studying structure UO2 and changes due to specific defects caused by doping, in stoichiometry, irradiation, or heating under oxidizing conditions. In this paper, we illustrate several aspects application study UO2, including use wavelength-dependent excitation (455, 532, 785 nm) assess effects doping (Nd, Th, Zr), ion situ oxidation (UO2 U3O8). Additionally, show examples how correlative microscopy possible using electron backscatter diffraction combined with maps vibration bands laser-induced luminescence generated rare-earth dopants matrix. For each these applications, suggest optimal wavelengths that vary depending on desired data. Blue (455 tends promote even at low powers, but because spectra change little irradiation-induced are easier observe. Green (532 observing electron–phonon resonance offers a good compromise high-temperature experiments, delivering high-quality both U3O8. Infrared (785 best “defect” associated as irradiation small. particularly suited stability towards presence simulating fission products, where resonant effects, dopant luminescence, mapping can be used together investigate structural rearrangement function temperature. These offer insight into microstructural fuels higher burnups envisioned future reactors.