Angular and velocity distributions of HD molecules produced by the H/sub 2/--D/sub 2/ exchange reaction on the stepped Pt(557) surface

Journal Article · Sun Jul 15 04:00:00 EDT 1984 · J. Chem. Phys.; (United States)

OSTI ID:6761904

Lin, T H; Somorjai, G A

The H/sub 2/--D/sub 2/ exchange reaction on Pt(557) crystal surface was investigated using a molecular beam surface scattering technique. The angular and velocity distributions of the HD product were measured at various crystal temperatures (500--1170 K). It was found that the exchange reaction occurred via interactions of adsorbed H and D atoms (Langmuir--Hinshelwood mechanism). Although the HD that is produced desorbs with a cos/sup 2/ theta angular distribution, its translational energy corresponds to a temperature slightly colder than that of the substrate with the mean energy of the desorbing molecules depending on the desorption angle. As the desorbing angle increases away from the surface normal, the mean translational energy decreases. The exchange reactivity was found to be incident azimuthal angle dependent while the translational energy of the product HD is independent of the azimuthal angle of detection.

• Research Organization: Materials and Molecular Research Division, Lawrence Berkeley Laboratory and Department of Chemistry, University of California, Berkeley, California 94720
• OSTI ID: 6761904
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 81:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR DISTRIBUTION
BEAMS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COLLISIONS
DESORPTION
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
DISTRIBUTION
ELEMENTS
HIGH TEMPERATURE
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
METALS
MOLECULAR BEAMS
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PLATINUM
PLATINUM METALS
STABLE ISOTOPES
SURFACES
TRANSITION ELEMENTS
VELOCITY