Long-range repulsive interaction between molecules on a metal surface induced by charge transfer |
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Authors: | Fernandez-Torrente I Monturet S Franke K J Fraxedas J Lorente N Pascual J I |
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Institution: | Institut für Experimentalphysik, Freie Universit?t Berlin, Arnimallee 14, 14195 Berlin, Germany. |
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Abstract: | The adsorption of a molecular electron donor on Au(111) is characterized by the spontaneous formation of a superlattice of monomers spaced several nanometers apart. The coverage-dependent molecular pair distributions obtained from scanning tunneling microscopy data reveal an intermolecular long-range repulsive potential, which decreases as the inverse of the molecular separation. Density functional theory calculations show a charge accumulation in the molecules due to electron donation into the metal. Our results suggest that electrostatic repulsion between molecules persists on the surface of a metal. |
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