Controlling organic reactions on silicon surfaces with a scanning tunneling microscope: Theoretical and experimental studies of resonance-mediated desorption

Saman Alavi, Roger Rousseau, Gregory P. Lopinski, Robert A. Wolkow, Tamar Seideman

Research output: Contribution to journalArticle

33 Citations (Scopus)


The dynamics of tip-induced, resonance-mediated bond-breaking in complex organic adsorbates is studied theoretically and experimentally. Desorption of benzene from a Si(100) surface is found to be efficient and sensitive to voltage, the measured yield rising from below 10-10 to ca. 10-6 per electron within a ca. 0.8 V range at low ( < 100 pA) current. A theoretical model, based upon first principles electronic structure calculations and quantum mechanical wavepacket simulations, traces these observations to multi-mode dynamics triggered by a transition into a cationic resonance. The model is generalized to provide understanding of, and suggest a means of control over, the behaviour of different classes of organic adsorbates under tunneling current.

Original languageEnglish
Pages (from-to)213-229
Number of pages17
JournalFaraday Discussions
Publication statusPublished - Jan 1 2000


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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