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Site-hopping of adsorbed CO in c(4x2)-CO/Ni(111) by laser-induced temperature jump: Time-resolved sum-frequency generation observation

被引：17
作者：
Kubota, J
Yoda, E
Ishizawa, N
Wada, A
Domen, K
Kano, SS
机构：
[1] Tokyo Inst Technol, Chem Resources Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan
[2] Hosei Univ, Tokyo 1848584, Japan
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2003年 / 107卷 / 38期
关键词：
D O I：
10.1021/jp030123g
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The c(4 x 2)-CO/Ni(111) surface under pulsed near-infrared irradiation is examined by time-resolved sum-frequency generation (SFG) spectroscopy. At a surface coverage of 0.5, the surface is confirmed to consist almost exclusively of hollow CO molecules, as evidenced by a sole SFG peak at 1904 cm(-1). Under pulsed irradiation, this peak weakened, followed by the emergence of a new peak attributable to atop CO. This represents a direct observation of site-hopping of adsorbed CO. The hopping phenomenon was found to be entirely transient, with the surface returning to the pre-excited state within a few hundred picoseconds without desorption. The dynamics of the process are also discussed.
引用
收藏
页码：10329 / 10332
页数：4
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