Direct observation of hydrogen-bond exchange within a single water dimer
Direct observation of hydrogen-bond exchange within a single water dimer
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DOI：
10.1103/physrevlett.100.166101
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发表时间：
2008-04-25
影响因子：
8.6
通讯作者：
Morikawa, Y.
中科院分区：
文献类型：
--
作者：
Kumagai, T.;Kaizu, M.;Morikawa, Y.
使用扫描隧道显微镜在单分子水平上研究了水二聚体的动力学。水二聚体中的两个分子在 6 K 下结合在 Cu(110) 表面，观察到它们通过氢键重排交换氢键供体和受体的角色。 (H(2)O)(2) 的交换率比 (D(2)O)(2) 高 60 倍，表明该过程涉及量子隧道效应。在激发与反应坐标相关的分子间模式时，交换率得到增强。
The dynamics of water dimers was investigated at the single-molecule level by using a scanning tunneling microscope. The two molecules in a water dimer, bound on a Cu(110) surface at 6 K, were observed to exchange their roles as hydrogen-bond donor and acceptor via hydrogen-bond rearrangement. The interchange rate is similar to 60 times higher for (H(2)O)(2) than for (D(2)O)(2), suggesting that quantum tunneling is involved in the process. The interchange rate is enhanced upon excitation of the intermolecular mode that correlates with the reaction coordinate.