Sensitivity of x-ray absorption at $5d$ edges of high-valent light actinides to crystal-field strength and covalency effects

Johan Vegelius, David K. Shuh, Sergei M. Butorin

The $5f$ states were probed in ThO${}_2$ and U(VI) and U(V) oxides using x-ray absorption spectroscopy at the actinide $O_{4,5}$ edges. Measured data were analyzed by several approac…