Inelastic helium-scattering studies of ordered Ar, Kr, and Xe monolayers physisorbed on Ag(111): dispersion curves, scattering cross sections, and excitation lineshapes. Interim technical report
This paper is the first in a series covering the authors experiments examining the physical properties of ordered overlayers of Ar, Kr, and Xe physisorbed on Ag(111). In this paper, they examine the desorption kinetics of the Xe monolayer/Ag(111) system. Desorption is zeroth order until approx. 90% of the monolayer has desorbed, then becomes first order. They also measured the inelastic scattering of an 18-meV He beam from unconstrained monolayers of (111) oriented Ar, Kr, and Xe. The transitions are mapped across the entire surface Brillouin zone from T and M. The data are dispersionless, indicating that for the measured mode the adatoms are behaving as independent Einstein oscillators. Parametrized physisorption potentials for RG-Ag(111) (RG=Ar, Xe) are constructed using these results. Inelastic-scattering probabilities and linewidths also presented. The inelastic-scattering probabilities vary by at most a factor of 3 across the entire surface Brillouin zone, and are reported as a function of incident angle, final vector, and surface temperature.
- Research Organization:
- Chicago Univ., IL (USA). Dept. of Chemistry
- OSTI ID:
- 6574796
- Report Number(s):
- AD-A-199087/8/XAB; TR-12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
ARGON
ATOM COLLISIONS
ATOMIC BEAMS
BEAMS
BRILLOUIN ZONES
COLLISIONS
DESORPTION
DISPERSION RELATIONS
DOCUMENT TYPES
DYNAMICS
ELEMENTS
ENERGY
FILMS
FLUIDS
FREE ENERGY
GASES
HELIUM
INELASTIC SCATTERING
KINETICS
KRYPTON
MECHANICS
METALS
NONMETALS
PHONONS
PHYSICAL PROPERTIES
PROBABILITY
PROGRESS REPORT
QUASI PARTICLES
RARE GASES
SCATTERING
SILVER
SPECTROSCOPY
SURFACE ENERGY
SURFACE PROPERTIES
SURFACES
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENTS
XENON
ZONES