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We investigate the Ir(110)-c(2x4)S adsorbate system using X-ray photoelectron diffraction. As proposed by a previous structure model based on a scanning tunneling microscopy experiment, we find that sulfur atoms of this superstructure enter the second adsorption layer. In contrast to the existing structure model the adatoms do not occupy on-top adsorption sites above first-layer adatoms. We refine...
We compare the surface dynamics of the adsorbate systems Mo(110)-H and Mo(110)-Li. In both cases electron energy loss spectroscopy measurements revealed strong substrate surface phonon anomalies. Whereas the phonon anomaly of the hydrogen-covered surface was unequivocally assigned to be of the Kohn type, the anomalous behavior of the surface phonons of the lithium-covered surface remained obscure...
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