Organization-induced charge redistribution in self-assembled organic monolayers on gold |
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Authors: | Ray S G Cohen H Naaman R Liu Haiying Waldeck D H |
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Affiliation: | Department of Chemical Physics and Chemical Research Support, Weizmann Institute, Rehovot 76100, Israel. |
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Abstract: | The charge redistribution that occurs within dipolar molecules as they self-assemble into organized organic monolayer films has been studied. The extent of charge transfer is probed by work function measurements, using low-energy photoelectron spectroscopy (LEPS), contact potential difference (CPD), and X-ray photoelectron spectroscopy (XPS), with the latter providing fine details about the internal charge distribution along the molecule. In addition, two-photon photoelectron spectroscopy is applied to investigate the electronic structure of the adsorbed layers. We show that charge transfer acts to reduce the dipole-dipole interaction between the molecules but may either decrease or increase the molecule-to-surface dipole moment. |
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