200 Hz observation of hydrogenation reaction of Pd nanoparticles by using dispersive XAFS optics

Observation of X-ray absorption fine structure (XAFS) spectroscopy with dispersive optics is attractive application for the study of chemical reaction from a viewpoint of real-time-resolved structural change. We have constructed dispersive optics for XAFS spectroscopy measurement at SPring-8 BL14B1 and succeeded to detect real-time-resolved structural transformation of Pd nanoparticles under hydrogenation reaction with high reaction rate at room temperature. 200 Hz observation of the hydrogenation reaction of Pd nanoparticles reveals the expansion of Pd-Pd interatomic distance with a time step of 5 ms by analysing extended X-ray absorption fine structure (EXAFS) region.