Local electronic states at molecule-metal interfaces studied by metastable atom electron spectroscopy

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Electron emission spectra resulting from thermal collision of metastable atoms with organic molecules on transition-metal surfaces were observed to characterize the local electronic properties at the organic-metal interfaces and to clarify the relation to electric conductivities in molecular junctions. Based on the experimental data and first-principles calculations, we showed that the interface electronic states near the Fermi level are classified into damping and propagating types depending on asymptotic behavior of metallic wave functions. It was also shown that such a new characterization correlates closely to transport properties in nanolink systems.