Anomalous Au(111) surfaces studies by LEED, AES, and oxygen chemisorption
LEED patterns obtained from clean Au(111) surfaces, show that each integral order diffraction beam in the normal (1 x 1) pattern is surrounded by hexagonal arrays of reflections aligned along the (110). The spacing between these additional diffraction features is approximately 4 percent of that between the integral order beams and leads to the suggestion that the outermost layer of atoms is not completely coherent with respect to the bulk structure. Oxygen was found to adsorb on the clean surface at sample temperatures above 500/sup 0/C but its presence did not affect the LEED pattern. An increased rate of adsorption was observed on surfaces which contained small quantities of Ca. This chemisorbed oxygen could be removed by ion bombardment but not by heating up to 800/sup 0/C.
- Research Organization:
- Oak Ridge National Lab., Tenn. (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5282236
- Report Number(s):
- CONF-770908-5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
AUGER EFFECT
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
CRYOGENIC FLUIDS
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
ELECTRON DIFFRACTION
ELEMENTS
FLUIDS
GOLD
METALS
MONOCRYSTALS
NONMETALS
OXYGEN
SCATTERING
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRANSITION ELEMENTS