Dresden 2006 – wissenschaftliches Programm
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O: Oberflächenphysik
O 14: Poster session I (Adsorption, Epitaxy and growth, Phase transitions, Surface reactions, Organic films, Electronic structure, Methods) (sponsored by Omicron Nanotechnology GmbH)
O 14.3: Poster
Montag, 27. März 2006, 18:00–21:00, P2
H/Pt(110) (1x4): Hydrogen induced row pairing on the missing row reconstructed surface. — •Alexander Menzel1, Enrico Donà1, Mariana Minca1, Erminald Bertel1, Rinaldo Zucca2, and Joseph Redinger2 — 1Institut für Physikalische Chemie, Innrain 52a, A-6020 Innsbruck, Austria — 2Center for Computational Materials Science, Gumpendorferstraße 1A, A-1060 Vienna, Austria
Various phases of hydrogen on Pt(110) are investigated by temperature programmed desorption spectroscopy (TPD), quantitative low-energy electron diffraction (LEED) and variable-temperature scanning tunneling microscopy (VT-STM). H is initially taken up with a sticking coefficient of almost one into the short-bridge sites of the close-packed rows of the Pt(110)-(1x2) missing-row reconstructed surface. After saturation of these sites the sticking coefficient drops significantly and further uptake of up to 1.5 monolayers (ML) into lower-binding energy sites is observed. Beyond 1.5 ML extensive H exposures give rise to an autocatalytic desorption feature similar to Ni(110){1}. LEED shows the formation of a (1x4) structure, which is only seen at low primary energies. VT-STM reveals that this structure is due to a row pairing. Again this parallels findings on Ni(110), where at low temperatures also a pairing row reconstruction is observed [1]. Surprisingly, however, the row pairing in the present case involves rows which are separated by almost 0.8 nm due to the missing row reconstruction. ∖Zitat{1} {K. Christmann, Surf. Sci. Rep. 9, 1 (1988)}