Weak intermolecular interactions in an ionically bound molecular adsorbate: Cyclopentadienyl/Cu(111)

H. Hedgeland, B. A.J. Lechner, F. E. Tuddenham, A. P. Jardine, W. Allison, J. Ellis, M. Sacchi, S. J. Jenkins, B. J. Hinch

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The dissociative adsorption of cyclopentadiene (C5H6) on Cu(111) yields a cyclopentadienyl (Cp) species with strongly anionic characteristics. The Cp potential energy surface and frictional coupling to the substrate are determined from measurements of dynamics of the molecule together with density functional calculations. The molecule is shown to occupy degenerate threefold adsorption sites and molecular motion is characterized by a low diffusional energy barrier of 40±3meV with strong frictional dissipation. Repulsive dipole-dipole interactions are not detected despite charge transfer from substrate to adsorbate.

Original languageEnglish (US)
Article number186101
JournalPhysical review letters
Issue number18
StatePublished - May 2 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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