Inducing and observing the abstraction of a single hydrogen atom in bimolecular reactions with a scanning tunneling microscope

L. J. Lauhon, W. Ho*

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

A variable-temperature scanning tunneling microscope (STM) was used to initiate and observe the abstraction of a single hydrogen atom in a simple bimolecular reaction. Dicarbon (CC) on the Cu(001) surface reacted separately with hydrogen sulfide (H2S) and water (H2O) to form CCH + SH and CCH + OH, respectively. At 9 K, hydrogen abstraction from H2O occurred spontaneously upon contact between CC and thermally diffusing H2O molecules. Hydrogen abstraction from H2S was effected at 9 K by inducing H2S diffusion via excitation with tunneling electrons. The thermal diffusion and reaction of H2S and CC were also observed at 45 K. By removing a single hydrogen atom from H2S and H2O using tunneling electrons, we established the identities of the sulfhydryl (SH) and hydroxyl (OH) reaction products. SH and OH did not react with CC under conditions that led to the reaction of the parent molecules. The bimolecular reactions H2O + O → 2OH and H2S + O → SH + OH did not occur thermally at 9 K but were induced by tunneling electrons.

Original languageEnglish (US)
Pages (from-to)3987-3992
Number of pages6
JournalJournal of Physical Chemistry B
Volume105
Issue number18
DOIs
StatePublished - May 10 2001

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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