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Report No.

X-ray diffraction study on hydrogen-induced Pd(110) surface reconstruction

Takahashi, Masamitsu; Fujikawa, Seiji*; Hu, W.; Tajiri, Hiroo*

Absorption of hydrogen into a substrate begins with dissociated adsorption of hydrogen molecules. The mechanism of the transition from adsorption to absorption is an important knowledge for improving the performance of hydrogen storage materials. The aim of the present study is to verify the hydrogen absorption model in atomic scale through quantitative determination of structures of hydrogen-adsorbed Pd(110) by synchrotron X-ray diffraction. Experiments were performed at a synchrotron beamline 13XU at SPring-8 using a surface X-ray diffractometer integrated with a UHV chamber equipped with a cryostat. We measured five crystal truncation rod (CTR) profiles with increasing substrate temperature to room temperature from 57 K after the substrate was exposed to 10$$^{-6}$$ Torr s hydrogen. Results show an atomic-scale picture that explains how adsorbed hydrogen is absorbed into the Pd bulk.



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