Papers presented at the workshop on photons and scanning probe microscopies, Konstanz July 1992.
- Autor(in)
- Sponsor(in)
- Referenz
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10 M. Volcker, PhD. Thesis, Ludwig-Maximilians-University of Munich
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- Seitenbereich
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0126 - 0132
- Schlagwort(e)
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<KWD>Rectified current
Adsorbate vibrational mode
Field enhancement
- Zusammenfsg.
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We consider the problem of the rectified current induced by laser radiation in the STM junction when the tip is placed above a small molecule like CO or NO. This is calculated assuming a simple tight-binding model for the tunneling junction including the adsorbate and using nonequilibrium Green's functions techniques. The coupling between tunneling electrons and the molecule vibrational modes is taken into account by a local electron-phonon interaction term. In a second step we estimate the excitation rate of the molecule vibrations for a given laser power. This value is then used to obtain the relative change in the rectified current when the laser is in resonance with a molecule vibration. For a moderate laser power of 2 kW/cm<sup>2</sup> a relative change of 1 to 3% is predicted.
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