Abstract
A double-electron excitation in -edge x-ray absorption spectra of actinides has been observed for the first time. The investigation of this effect is presented. Actinide species in valence states IV and III were investigated by using experimental data of , , , , and hydrates. The double-electron excitation was identified as a shake-up effect. Energy positions of the double-electron features were found in good agreement with the approximation. The resonance intensity corresponds with the resonance of the edge. This has been observed by comparing the , , and XANES spectra of , as well as the XANES spectra of Np in oxidation states IV, V, VI, and VII. Influences of the double-electron excitation on the EXAFS signal are discussed.
- Received 26 July 2006
DOI:https://doi.org/10.1103/PhysRevB.75.035120
©2007 American Physical Society