Abstract
We report the use of electrical measurements to identify simultaneously the number andtype of organic molecules within metal–molecule–metal junctions. Our strategy combinesanalyses of single-molecule conductance and inelastic electron tunneling spectra, exploitinga nanofabricated mechanically controllable break junction. We found that the peaklinewidth of the inelastic electron tunneling spectrum decreased as the modulation voltageand temperature decreased, and that the selection rule for inelastic electron tunnelingspectroscopy agrees with that for Raman spectroscopy. Furthermore, the differentialconductance curve of the single-molecule junction suggests that it has asymmetricalelectrode–molecule coupling.
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