5f covalency from x-ray resonant Raman spectroscopy

Abstract

X-ray resonant Raman spectroscopy (XRRS), a variant of resonant inelastic x-ray scattering, has been used to investigate the two prototype systems, UF4 and UO2. Both are U5f2 and each is an example of 5f localized, ionic behavior and 5f localized, covalent behavior, respectively. From the M5 XRRS measurements, the 5f band gap in each can be directly determined and, moreover, a clear and powerful sensitivity to 5f covalency emerges.