X-RAY ABSORPTION-SPECTROSCOPY OF THE CONTINUOUS CHANGE FROM CE(IV) TO CE(III)

The fast acquisition method for X-ray Absorption Spectroscopy was used to obtain the Extended X-ray Absorption Fine Structure (EXAFS) and the X-ray Absorption Near Edge Structure (XANES) of the dynamical redox process in the Ce(IV)/Ce(III) chemical solutions system. From the XANES data, the relative concentration of both species was determined as a function of time and from the EXAFS data two different distances and two coordination numbers were found for the initial and final states, respectively. The analysis of the consecutive steps of the reaction indicates the absence of intermediate valence states of the cerium ions.