Single molecule thermal rotation and diffusion: Acetylene on CU(001)

L. J. Lauhon*, W. Ho

*Corresponding author for this work

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

A variable temperature scanning tunneling microscope was used to directly observe the thermally induced rotation of a single acetylene molecule between two equivalent orientations on Cu(001) above 68 K. Measurements of the rotation rate as a function of temperature yielded an energy barrier of 169±3 meV and a preexponential factor of 1011.8±0.2 s-1. Thermal diffusion of individual acetylene molecules was monitored above 178 K by single molecule tracking. A diffusion barrier of 0.53±0.01 eV and a preexponential factor of 1013.6±0.2 s-1 were determined by measuring the hopping rate as a function of temperature.

Original languageEnglish (US)
Pages (from-to)5633-5636
Number of pages4
JournalJournal of Chemical Physics
Volume111
Issue number13
DOIs
StatePublished - Oct 1 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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