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Author Estrup, P. J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ MOLYBDENUM ♦ CHEMISORPTION ♦ CRYSTAL-PHASE TRANSFORMATIONS ♦ ELECTRON DIFFRACTION ♦ TUNGSTEN ♦ ADSORPTION ♦ CRYSTAL DEFECTS ♦ HYDROGEN ♦ PHASE DIAGRAMS ♦ SUBSTRATES ♦ CHEMICAL REACTIONS ♦ COHERENT SCATTERING ♦ CRYOGENIC FLUIDS ♦ CRYSTAL STRUCTURE ♦ DIAGRAMS ♦ DIFFRACTION ♦ ELEMENTS ♦ FLUIDS ♦ METALS ♦ NONMETALS ♦ PHASE TRANSFORMATIONS ♦ REFRACTORY METALS ♦ SCATTERING ♦ SEPARATION PROCESSES ♦ SORPTION ♦ TRANSITION ELEMENTS ♦ Metals & Alloys- Structure & Phase Studies
Abstract The surface ''phases'' observed by LEED and other techniques in adsorption studies are usually ascribed to pairwise interactions between the adsorbate and the substrate, and between the adsorbed species themselves. However, in the case of chemisorbed hydrogen : and probably other overlayers : on W(100) and Mo(100) the phase changes appear to involve an adsorbate-induced reconstruction of the substrate. The structures are similar to those observed on the clean substrates at low temperture and they are characterized by a periodic lattice distortion whose wave vector depends on the adsorbate density and the temperature. Presumably the driving mechanism involves a lowering of the surface electronic energy and the periodicity may therefore reflect the geometry of the two-dimensional Fermi surface.
Educational Use Research
Learning Resource Type Article
Publisher Date 1979-03-01
Publisher Place United States
Journal J. Vac. Sci. Technol.
Volume Number 16
Issue Number 2
Organization Department of Physics and Department of Chemistry, Brown University, Providence, Rhode Island 02912


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