Ma Xucun, Jiang Peng, Qi Yun, Jia Jinfeng, Yang Yu, Duan Wenhui, Li Wei-Xue, Bao Xinhe, Zhang S B, Xue Qi-Kun
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
Proc Natl Acad Sci U S A. 2007 May 29;104(22):9204-8. doi: 10.1073/pnas.0611024104. Epub 2007 May 21.
Here we present direct observation of a quantum reactivity with respect to the amounts of O(2) adsorbed and the rates of surface oxidation as a function of film thickness on ultrathin (2-6 nm) Pb mesas by scanning tunneling microscopy. Simultaneous spectroscopic measurements on the electronic structures reveal a quantum oscillation that originates from quantum well states of the mesas, as a generalization of the Fabry-Pérot modes of confined electron waves. We expect the quantum reactivity to be a general phenomenon for most ultrathin metal films with broad implications, such as nanostructure tuning of surface reactivities and rational design of heterogeneous catalysts.
在这里，我们通过扫描隧道显微镜对超薄（2 - 6纳米）铅台面进行了量子反应性的直接观察，该反应性与吸附的O₂量以及表面氧化速率有关，且是薄膜厚度的函数。对电子结构的同步光谱测量揭示了一种量子振荡，它源于台面的量子阱态，这是受限电子波的法布里 - 珀罗模式的一种推广。我们预计这种量子反应性对于大多数超薄金属薄膜来说是一种普遍现象，具有广泛的影响，例如表面反应性的纳米结构调控和多相催化剂的合理设计。
