Observation of two-dimensional compositional ordering of a carbon monoxide and argon monolayer mixture physisorbed on graphite

Journal Article · Mon Jan 20 04:00:00 EST 1986 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.56.244· OSTI ID:6145815

You, H; Fain, Jr, S C; Satija, S; Passell, L

Commensurate monolayers of a mixture of 70% carbon monoxide and 30% argon on graphite are studied by neutron and low-energy-electron diffraction. A 2 x 2 superstructure due to 3:1 compositional ordering is observed below 25 K. The compositional ordering is most likely due to molecular-axis ordering of carbon monoxide molecules into a pinwheel pattern with argon atoms at the central sites of each pinwheel. Such a pinwheel structure has been predicted by Harris, Mouritsen, and Berlinsky for planar rotors with anisotropic interactions on a triangular lattice with vacancies.

• Research Organization: Department of Physics, University of Washington, Seattle, Washington 98195
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6145815
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 56:3; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ADSORPTION
ARGON
ATOMS
CARBON
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COATINGS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISPERSIONS
ELECTRON DIFFRACTION
ELEMENTAL MINERALS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
GRAPHITE
INFORMATION
LAYERS
MINERALS
MIXTURES
MOLECULES
NONMETALS
NUMERICAL DATA
ORDER PARAMETERS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SCATTERING
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
VERY LOW TEMPERATURE