State-selective dissociation of a single water molecule on an ultrathin MgO film.
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 pathway--vibrational excitation and electronic excitation--are 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.
Shin
Hyung-Joon
HJ
Surface Chemistry Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
Jung
Jaehoon
J
Motobayashi
Kenta
K
Yanagisawa
Susumu
S
Morikawa
Yoshitada
Y
Kim
Yousoo
Y
Kawai
Maki
M
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