State-selective dissociation of a single water molecule on an ultrathin MgO film
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- State-selective dissociation of a single water molecule on an ultrathin MgO film
- Shin, Hyung-Joon; Jung, Jaehoon; Motobayashi, Kenta; Yanagisawa, Susumu; Morikawa, Yoshitada; Kim, Yousoo; Kawai, Maki
- Atomic scale; Low temperatures; MgO films; Molecular process; Oxide surface; Reaction paths; Scanning tunnelling microscopy; Scientific fields; Single molecule level; Ultra-thin; Water molecule
- Issue Date
- NATURE PUBLISHING GROUP
- NATURE MATERIALS, v.9, no.5, pp.442 - 447
- The interaction of water with oxide surfaces has drawn considerable interest, owing to its application to problems in diverse scientific fields. Atomic-scale insights into water molecules on the oxide surface have long been recognized as essential for a fundamental understanding of the molecular processes occurring there. Here, we report the dissociation of a single water molecule on an ultrathin MgO film using low-temperature scanning tunnelling microscopy. Two types of dissociation pathwayvibrational excitation and electronic excitationare selectively achieved by means of injecting tunnelling electrons at the single-molecule level, resulting in different dissociated products according to the reaction paths. Our results reveal the advantage of using a MgO film, rather than bulk MgO, as a substrate in chemical reactions.
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