The adsorption of atomic hydrogen on a single crystal ZnO(1010) surface has been studied by scanning tunneling microscopy (STM) under ultrahigh vacuum conditions at room temperature and at elevated temperatures. High resolution STM images indicate that a well-ordered (1x1) H adlayer is formed on the ZnO(1010) surface. The STM data strongly indicate that the hydrogen adsorbs on top of the oxygen atoms forming hydroxyl species. Scanning tunneling spectroscopy (STS) studies reveal a H atom induced metallization at room temperature. In contrast to the clean surface for the hydrogen-covered surface distinct defects structures consisting of missing O and Zn atoms could be identified.
The growth of the polycyclic aromatic hydrocarbon perylene on (110) oriented copper substrates has been studied by means of x-ray photoelectron spectroscopy, near-edge x-ray absorption spectroscopy, and atomic force microscopy. In the monolayer regime, the molecules are orientated with their molecular plane parallel to the substrate, whereas they adopt a tilted arrangement in multilayer films. For multilayers with thicknesses exceeding 10 nm, the molecules grow in a bulk-like structure with their long axes orientated upright to the substrate surface.
The growth of ultrathin perylene films on Cu(110) and Cu(100) surfaces has been studied by means
of He atom scattering, low-energy electron diffraction, scanning tunneling microscopy, thermal desorption
spectroscopy, and X-ray photoelectron spectroscopy with a special emphasis on the interface structure.
In addition to several ordered submonolayer phases, two distinctly different monolayer structures were
found at substrate temperatures below 380 K and at about 450 K on Cu(110). The rather open saturation
structure formed at elevated temperatures reveals an enhanced density of substrate steps, which indicates
an adsorption-induced modification of the Cu(110) surface. In contrast to that, on Cu(100), only a close-packed c(8 × 4) monolayer structure is formed without any less-dense-packed structures.
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