(a) Constant-current image of clean Au(887) . Inset: Processed close-up view to reveal the discommensuration lines running along the direction . (b) Constant-current STM image of at 0.1 ML . (c) Constant-current STM image of at 0.5 ML .
Spectra of the differential conductivity for 0.5 ML (lower spectrum) and 1.0 ML (upper spectrum). The upper spectrum was offset by . For the lower (upper) spectrum the tunneling barrier was set at and ( and ). The full lines represent fits to the experimental data (depicted as dots).
Photoemission spectra of the C core level as a function of coverage. As discussed in the text, the large core-level shifts for 3 ML might be explained by photohole screening effects. The inset shows the high resolution spectra of the C satellite structure in 3 ML taken at .
(Color) Valence band photoemission spectra for layers of different thicknesses. As a function of coverage, the HOMO peak grows whereas the two Au(887) surface states S1 and S2 are quenched.
Near-edge x-ray absorption spectra at the carbon edge of on Au(887). The filled Gaussian denotes the transition into the HOMO-LUMO gap states of 0.5 ML .
Band diagrams for coverages of 0.5 ML (left panel) and 1 ML (right panel) on Au(887). For the latter we assume the absence of charge transfer and interfacial dipoles, and hence vacuum level (VL) alignment. For clusters, the presence of gap states allows the electron transfer from the substrate, which in turn leads to an interface dipole.
Energy positions of molecular orbitals of on Au(887) as derived from Ref. 16 (single molecules) and from fits to the tunneling spectroscopy data presented in Fig. 2.
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