Surface-phonon dispersion curves of KBr(001) via helium-atom scattering: Comparison with calculations
A helium-atom surface-scattering instrument, employing a time-of-flighttechnique to observe inelastically scattered He atoms, has been used to measurethe surface-phonon dispersion curves of the KBr(001) surface. Data werecollected in the two high-symmetry directions, <100> and<110>, over the entire Brillouin zone for a target temperatureof /similar to/115 K and incident He wave vector /ital k//sub /ital i//approx.7A/sup /minus/1/. The results show important differences from sometheoretical predictions of shell-model calculations that use parametersobtained by fitting bulk dispersion curves. In addition, the measured surfacedispersion curves of KBr and of RbCl (reported previously) deviate from''mirror-symmetry'' behavior, unlike their bulk dispersion curves.
- Research Organization:
- Department of Physics and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306(US); Department of Chemistry and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306
- OSTI ID:
- 6137005
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:17; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ATOM COLLISIONS
BRILLOUIN ZONES
BROMIDES
BROMINE COMPOUNDS
COLLISIONS
DISPERSION RELATIONS
ELEMENTS
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
LATTICE VIBRATIONS
NONMETALS
PHONONS
POTASSIUM BROMIDES
POTASSIUM COMPOUNDS
QUASI PARTICLES
RARE GASES
SURFACE PROPERTIES
ZONES