Lateral hopping of molecules induced by excitation of internal vibration mode
Lateral hopping of molecules induced by excitation of internal vibration mode
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DOI：
10.1126/science.1069016
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发表时间：
2002-03-15
期刊：
影响因子：
56.9
通讯作者：
Ueba, H
中科院分区：
文献类型：
--
作者：
Komeda, T;Kim, Y;Ueba, H
我们证明了吸附在Pd(110)表面上的一氧化碳(CO)分子的电子受激迁移是由扫描隧道显微镜尖端的非弹性隧穿电子激发高频(HF)振动模(C-O伸缩模)所引发的。然而，即使跃迁势垒低于CO/Pd(110)的跃迁势垒，也不能检测到CO/Cu(110)的跃迁现象。一个基于两个频率模(与横向跃迁相关的受阻平移模)与高频模结合电子-空穴对激发的非简谐耦合的理论模型，可以解释为什么CO在Pd(110)上能观察到跃迁，而在Cu(110)上没有。
We demonstrate electron-stimulated migration for carbon monoxide (CO) molecules adsorbed on the Pd(110) surface, which is initiated by the excitation of a high-frequency (HF) vibrational mode (C-O stretching mode) with inelastic tunneling electrons from the tip of scanning tunneling microscopy. The hopping phenomenon, however, cannot be detected for CO/Cu(110), even though the hopping barrier is lower than in the CO/Pd(110) case. A theoretical model, which is based on the anharmonic coupling between tow-frequency modes (the hindered-translational mode related to the lateral hopping) and the HF mode combined with electron-hole pair excitation, can explain why the hopping of CO is observed on Pd(110) but not on Cu(110).