Abstract
Oligo(phenylene-ethynylene), self-assembled monolayers on Au(111) have been studied with scanning tunneling microscopy. The oligo(phenylene-ethynylene) molecules are adsorbed in a flat-lying orientation. Time-resolved scanning tunneling microscopy measurements reveal that the molecules continuously switch back and forth between two nearly degenerate configurations. The energy difference between the two configurations is 22±5meV and the activation barrier for the transition from the low-energy configuration to the high-energy configuration is 0.65±0.03eV. A statistical analysis of the residence times revealed that the switching process is stochastic. We propose that the two level switching is due to a torsional mode of the central phenyl ring.
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