Inelastic helium-scattering studies of the surface vibrational spectroscopy and dynamics of ordered Ar, Kr, and Xe multilayers physisorbed on Ag(111). Interim technical report

Technical Report · Wed Jun 01 04:00:00 EDT 1988

OSTI ID:6590427

Gibson, K D; Sibener, S J

This is the second of three papers discussing the authors studies of overlayers of argon, krypton, and xenon physisorbed on Ag(1I1). All of these rare gases form ordered structures, which are azimuthally aligned but translationally incommensurate with the Ag substrate. This paper discusses experiments wherein they utilized the angle-resolved time of flight of inelastically scattered 18-meV He atoms to examine the surface dynamics of multilayer rare gas films along the r - M direction. This was done on a layer-by-layer basis for 2, 3, and >20 layers for each of the rare gases. Unlike the monolayers, the vibrational modes observed for the multilayers show dispersion across the surface Brillouin zone, the amount of dispersion increasing with the number of adsorbed layers. These results reveal in detail how the surface dynamical properties of a thin film evolve towards those of a thick crystal as a function of increasing dimension. Lattice-dynamics calculations, which utilize realistic gas-phase pair potentials, reproduce the experimentally observed phonon dispersion relations quite well. The authors also examine the inelastic-scattering probabilities and linewidths of the transitions.

• Research Organization: Chicago Univ., IL (USA). Dept. of Chemistry
• OSTI ID: 6590427
• Report Number(s): AD-A-199088/6/XAB; TR-13
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ADSORPTION
ARGON
ATOM COLLISIONS
ATOMIC BEAMS
ATOMS
BEAMS
BRILLOUIN ZONES
COLLISIONS
CRYSTALS
DESORPTION
DIMENSIONS
DISPERSION RELATIONS
DOCUMENT TYPES
DYNAMICS
ELEMENTS
ENERGY
FILMS
FLUIDS
FREE ENERGY
GASES
HELIUM
INELASTIC SCATTERING
KINETICS
KRYPTON
LAYERS
MECHANICS
METALS
NONMETALS
PHONONS
PHYSICAL PROPERTIES
PROBABILITY
PROGRESS REPORT
QUASI PARTICLES
RARE GASES
SCATTERING
SILVER
SORPTION
SPECTROSCOPY
SUBSTRATES
SURFACE ENERGY
SURFACE PROPERTIES
SURFACES
THERMODYNAMIC PROPERTIES
THICKNESS
THIN FILMS
TRANSITION ELEMENTS
XENON
ZONES