针尖诱导Si（001）上烷基的$β$ -氢解离
Tip-Induced $β$-Hydrogen Dissociation in an Alkyl Group Bound on Si(001)
摘要：
用扫描隧道显微镜研究了Si（001）表面吸附乙基的原子尺度化学修饰。在样品偏压> +1.5V下的调谐导致尖端诱导的共价结合乙基构型的$β$ -氢的C-H裂解。该反应的特征在于形成额外的Si-H和Si-C键。在300 K时，反应几率与隧穿电流呈线性关系;在50 K时，反应受到很大程度的抑制。因此，在室温下观察到的尖端诱导的表面反应归因于与热活化相结合的单电子激发。
英文摘要：
Atomic-scale chemical modification of surface-adsorbed ethyl groups on Si(001) was induced and studied by means of scanning tunneling microscopy. Tunneling at sample bias > +1.5V leads to tip-induced C-H cleavage of a $β$-hydrogen of the covalently bound ethyl configuration. The reaction is characterized by the formation of an additional Si-H and a Si-C bond. The reaction probability shows a linear dependence on the tunneling current at 300 K; the reaction is largely suppressed at 50 K. The observed tip-induced surface reaction at room temperature is thus attributed to a one-electron excitation in combination with thermal activation.
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