Reactivity and structure of solid surfaces, phase II. Final report 1 Nov 71--31 Jul 75

Technical Report · Thu Jan 22 04:00:00 EST 1976

OSTI ID:7135379

Merrill, R P

Atomic and molecular beam scattering has been used along with LEED, Auger spectroscopy, and temperature programmed-desorption to study the structure of silver, platinum, tungsten, and iridium surfaces, and the interaction of helium, neon, argon, krypton, xenon, oxygen, hydrogen, methane, nitrogen, and carbon monoxide with these metal surfaces. Scattering of the rare gases displayed non-diffractive, quasi-elastic scattering for He/Ag(111), inelastic scattering for Ne, Ar, Kr/Ag(111), and trapping-dominated scattering for Xe/Ag(111). Rare gas scattering of He/W(112) gave quasi-elastic diffraction, Ne/W(112) gave inelastic rainbow scattering, and Ar, Kr, Xe/W(112) gave trapping-dominated scattering. The quasi-elastic helium diffraction has been represented well by semi-classical theory which can be extended to other surface scattering problems, including LEED. Scattering of polyatomic molecules has shown, that except for the hydrogenic molecules, rotational coupling is very weak compared to translational coupling. Adsorbed oxygen on Pt(111) results in a (2x2) LEED pattern but the surface mesh of the Pt(110) is unchanged for the adsorption at low temperatures in the reactive state. This surface chemistry on the single crystal plane is sufficient to explain quantitatively the oxygenation of carbon monoxide in a commercial catalytic muffler. (GRA)

• OSTI ID: 7135379
• Report Number(s): AD-A-023260
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKANES
ARGON
ATOMIC BEAMS
BEAMS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HELIUM
HYDROCARBONS
HYDROGEN
INDIUM
KRYPTON
METALS
METHANE
MOLECULAR BEAMS
NEON
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
RARE GASES
REFRACTORY METALS
SCATTERING
SILVER
SURFACE PROPERTIES
TRANSITION ELEMENTS
TUNGSTEN
XENON