Experimental observation of quantum oscillation of surface chemical reactivities
2007
Ma, Xucun | Jiang, Peng | Qi, Yun | Jia, Jinfeng | Yang, Yu | Duan, Wenhui | Li, Wei-Xue | Bao, Xinhe | Zhang, S.B. | Xue, Qi-Kun
Here we present direct observation of a quantum reactivity with respect to the amounts of O₂ 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.
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