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Measurement of the Rayleigh surface-phonon dispersion curve for NaCl(001) from high-resolution He time-of-flight spectroscopy and from kinematical focusing angles

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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Angular distributions and time-of-flight spectra have been measured for the collisions of 20-meV He atoms with a NaCl(001) surface in the <100> direction. Structures in the angular distribution and in the time-of-flight spectra due to elastic and inelastic scattering are measured and used to extract (1) a corrugation parameter of the rigid-atom surface potential zeta/sub 0/ = 0.34 A, (2) three bound-state energies of the He-surface potential, and (3) a surface-phonon Rayleigh dispersion curve out to the edge of the Brillouin zone. Furthermore, we were able to demonstrate that by rotating the crystal about the surface normal it is possible to unambiguously identify kinematical focusing features in the angular distributions. These features were then used to determine a surface-phonon dispersion curve in good agreement with that obtained from the time-of-flight experiments.

Research Organization:
Max-Planck-Institut fuer Stroemungsforschung, Boettingerstrasse 4-8, D-3400 Goettingen, Federal Republic of Germany
OSTI ID:
5811312
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 28:4; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

640301* -- Atomic
Molecular &amp; Chemical Physics-- Beams &amp; their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALI METAL COMPOUNDS
ANGULAR DISTRIBUTION
ATOM COLLISIONS
BRILLOUIN ZONES
CHLORIDES
CHLORINE COMPOUNDS
COLLISIONS
DATA
DISPERSION RELATIONS
DISTRIBUTION
ELASTIC SCATTERING
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
FOCUSING
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
INELASTIC SCATTERING
INFORMATION
NONMETALS
NUMERICAL DATA
PHONONS
POTENTIALS
QUASI PARTICLES
RARE GASES
RAYLEIGH WAVES
SCATTERING
SEISMIC SURFACE WAVES
SEISMIC WAVES
SODIUM CHLORIDES
SODIUM COMPOUNDS
SPECTRA
SURFACE POTENTIAL
TIME-OF-FLIGHT METHOD
ULTRAHIGH VACUUM
ZONES