Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session I (Metal, semiconductor and oxide substrates: structure and adsorbates; Graphene)

O 35.3: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B1

A LEED investigation of the Au(111)-(1×1) surface — Birgit Vogt and •Jochen Vogt — Chemisches Institut der Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany

Although the ground state of the clean Au(111) surface shows reconstruction [1], the latter can be lifted, e. g. electrochemically, by stress, or by the presence of surface imperfections. For the clean unreconstructred Au(111)-(1×1) surface, both a layer distance compression as well as an anomalous layer distance expansion have been proposed at the solid vacuum interface [2,3]. We have prepared and characterized clean Au(111) surfaces by means of LEED, STM, XPS, and AES. The softly-annealed surfaces exhibit bright LEED diffraction patterns of (1×1) symmetry over a large energy range up to 450 eV. The measured diffraction beam intensities as a function of electron energy were the basis of a surface structure analysis. The structural results for the Au(111)-(1×1) surface are discussed in the context of reported structure data in literature and possible sources of error.
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