Control and characterization of cyclopentene unimolecular dissociation on Si(100) with scanning tunneling microscopy

Nathan L. Yoder, James S. Fakonas, Mark C. Hersam

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8 Citations (Scopus)


Dissociation of individual cyclopentene molecules on the Si(100) surface is induced and investigated using cryogenic ultrahigh vacuum scanning tunneling microscopy (STM). Using a secondary feedback loop during elevated tunneling current and sample biasing conditions, the cyclopentene dissociation products are isolated and then characterized with atomic-scale spatial resolution. Using multibias STM and density functional theory, the cyclopentene dissociation products are shown to consist of a C5H7 fragment and an individual H atom. The C5H7 fragment contains a C=C double bond and is bound to the Si(100) surface via a single Si - C covalent bond, while the individual H atom can be induced to hop between two sites on a single silicon dimer with the STM tip. This study shows that the use of feedback control during STM-induced single molecule reactions allows transient reaction products to be captured and thus more thoroughly studied. While demonstrated here for cyclopentene on Si(100), this feedback-controlled approach can likely be applied to a wide array of chemical reactions on semiconductor surfaces.

Original languageEnglish
Pages (from-to)10059-10065
Number of pages7
JournalJournal of the American Chemical Society
Issue number29
Publication statusPublished - Jul 29 2009


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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