Interpretation of features in the surface-phonon dispersion curves of KBr(001) and RbBr(001)

Journal Article · Tue May 15 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.10146· OSTI ID:7056455

Safron, S A; Chern, G; Brug, W P; Skofronick, J G ^[1]; Benedek, G ^[2]

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1. Department of Chemistry, Florida State University, Tallahassee, Florida 32306-3006 (USA) Department of Physics, Florida State University, Tallahassee, FL (USA)
2. Max-Planck-Institut fuer Stroemungsforschung, Bunsenstrasse 10, D-3400 Goettingen (Federal Republic of Germany)

The crossing surface mode and an anomaly in the optical surface-phonon dispersion recently observed in KBr(001) by means of helium scattering are analyzed and interpreted on the basis of a Green's-function calculation of KBr(001) surface dynamics. The nature and origin of crossing modes in isobaric crystals like RbBr and nonisobaric crystals like KBr are reexamined in light of a general mechanism based on LA-LO hybridization in the {l angle}100{r angle} direction. Their dispersion is then accounted for in terms of zone-boundary bands, specifically TA{sub 2}. LA-LO hybridization is also invoked to explain the anomaly observed in the optical surface mode.

• DOE Contract Number: FG05-85ER45208
• OSTI ID: 7056455
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:14; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
ATOM COLLISIONS
BROMIDES
BROMINE COMPOUNDS
COLLISIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DISPERSION RELATIONS
ELEMENTS
FCC LATTICES
FLUIDS
FUNCTIONS
GASES
GREEN FUNCTION
HALIDES
HALOGEN COMPOUNDS
HELIUM
HYBRIDIZATION
NONMETALS
PHONONS
POTASSIUM BROMIDES
POTASSIUM COMPOUNDS
QUASI PARTICLES
RARE GASES
RUBIDIUM BROMIDES
RUBIDIUM COMPOUNDS
SURFACE PROPERTIES