Tunneling dynamics of a hydroxyl group adsorbed on Cu(110)
Tunneling dynamics of a hydroxyl group adsorbed on Cu(110)
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DOI：
10.1103/physrevb.79.035423
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发表时间：
2009-01-01
影响因子：
3.7
通讯作者：
Morikawa, Y.
中科院分区：
文献类型：
--
作者：
Kumagai, T.;Kaizu, M.;Morikawa, Y.
用扫描隧道显微镜（STM）研究了6 K时羟基（OH）及其二聚体吸附在Cu（110）上的动力学。对于单体，倾斜的OH轴通过氢原子隧穿在两个等效方向之间来回切换。通过激发与反应坐标直接相关的氢氧根弯曲模式的隧穿电子增强了运动。根据STM尖端在分子上的位置，非弹性电子隧穿光谱呈现峰值或低谷。羟基二聚体的开关运动被淬灭，因为它是由氢键形成稳定的，而它是由OH拉伸模式的非弹性激发引起的。
Dynamics of a hydroxyl (OH) group and its dimer adsorbed on Cu(110) is investigated at 6 K with a scanning tunneling microscope (STM). For the monomer, the inclined OH axis switches back and forth between the two equivalent orientations via hydrogen-atom tunneling. The motion is enhanced by tunneling electron that excites the OH bending mode that directly correlates with the reaction coordinate. The inelastic electron-tunneling spectra exhibit either peak or dip, depending on the position of the STM tip over the molecule. The switch motion is quenched for the hydroxyl dimer since it is stabilized by hydrogen-bond formation, whereas it is induced by inelastic excitation of the OH stretch mode.