Structure of atomic oxygen and carbon overlayers on the Mo(001) surface studied by low energy ion scattering

Journal Article · Fri Apr 01 04:00:00 EST 1983 · J. Vac. Sci. Technol., A; (United States)

DOI:https://doi.org/10.1116/1.572341· OSTI ID:5866809

Overbury, S H; Stair, P C

The bonding geometry of atomic overlayers composed of submonolayer quantities of pure oxygen, pure carbon, and a mixture of carbon and oxygen on a Mo(100) surface has been studied for the first time by low energy angle-resolved K/sup +/ and Li/sup +/ ion backscattering. The surface composition and long range ordering of the clean and adsorbate-covered surfaces were also characterized by Auger and LEED. The overlayers were generated in UHV by dissociative adsorption of O/sub 2/ or CO or by thermal cracking of C/sub 2/H/sub 4/ on the clean Mo(100) surface. The absence of double scattering along the (110) direction for the oxygen overlayer compared to the clean surface indicates that the oxygen atoms are located in fourfold hollows on the surface. This is confirmed by Monte Carlo simulations of the K/sup +/ scattering. Li/sup +/ scattering results corroborate this structural model. The K/sup +/ scattering energy distributions from pure carbon and mixed carbon/oxygen overlayers are very similar to the oxygen overlayer suggesting that carbon is also situated in the fourfold hollow.

• Research Organization: Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5866809
• Journal Information: J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 1:2; ISSN JVTAD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ADSORPTION
ALKENES
AUGER ELECTRON SPECTROSCOPY
BACKSCATTERING
BEAMS
BINDING ENERGY
CARBIDES
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMICAL BONDS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COHERENT SCATTERING
COLLISIONS
COMPUTERIZED SIMULATION
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFRACTION
DISSOCIATION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
ETHYLENE
GEOMETRY
HYDROCARBONS
ION BEAMS
ION COLLISIONS
ION SCATTERING ANALYSIS
IONS
LAYERS
LITHIUM IONS
MATHEMATICS
METALS
MOLYBDENUM
MOLYBDENUM CARBIDES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
MONTE CARLO METHOD
NONDESTRUCTIVE ANALYSIS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POTASSIUM IONS
PYROLYSIS
SCATTERING
SIMULATION
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ULTRAHIGH VACUUM