Journal
SURFACE SCIENCE
Volume 559, Issue 2-3, Pages 77-84Publisher
ELSEVIER
DOI: 10.1016/j.susc.2004.04.045
Keywords
near edge extended X-ray absorption fine structure (NEXAFS)-; reflection high-energy electron diffraction (RHEED); molecular beam epitaxy; interface states; surface structure; morphology; roughness; and topology; aromatics; silver; low index single; crystal surfaces
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Molecular orientations and adsorption structures of alpha-sexithienyl (6T) thin films grown on Ag(110) and Ag(111) surfaces were studied by near edge X-ray absorption fine structure (NEXAFS) and reflection high energy electron diffraction (RHEED). The out-of-plane (perpendicular to the surface) and in-plane (parallel to the surface) orientations of the 6T molecules were determined by analyzing the polarization dependence of S 1s to pi* or sigma* resonance intensity. 6T molecules grew on Ag(110) and Ag(111) with their molecular planes parallel to the substrate surface irrespective of film thickness. On Ag(110), a novel pseudo-one-dimensional structure of 6T molecules oriented toward [001] direction could be observed. The models for adsorption structures of 6T on Ag(110) and Ag(111) are proposed by taking account of the lattice commensurability. (C) 2004 Elsevier B.V. All rights reserved.
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