Dynamics of STM-Induced CO Desorption from Cu(111).

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  • Hasegawa Kazuhiko
    Department of Material and Life Science, Osaka University, Suita, Osaka 565–0871
  • Kasai Hideaki
    Department of Material and Life Science, Osaka University, Suita, Osaka 565–0871 Department of Applied Physics, Osaka University, Suita, Osaka 565–0871
  • Diño Wilson Agerico
    Department of Applied Physics, Osaka University, Suita, Osaka 565–0871
  • Okiji Ayao
    Wakayama National College of Technology, Gobo, Wakayama 644–0023

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説明

We propose a simple model to describe the dynamics of STM-induced desorption of a single CO molecule from Cu(111). In the model, a single electron initially occupies the CO 2π*-orbital. An excitation of the CO-Cu stretching vibration then occurs when this electron subsequently transfers/tunnels from the CO 2π*-orbital to the metal substrate. When the excitation of the CO-Cu stretching vibration exceeds some predesorption level in a truncated harmonic oscillator well, CO is desorbed from Cu(111). The results of our model calculation for the desorption probability agree quite well with recent experimental results.

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