Surface dynamics of NaCl(001) by inelastic He atom scattering

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)

DOI:https://doi.org/10.1116/1.576683· OSTI ID:6769084

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

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1. Departments of Chemistry, The Florida State University, Tallahassee, FL (USA) Department of Physics, The Florida State University, Tallahassee, FL (USA) MARTECH, The Florida State University, Tallahassee, FL (USA)
2. Department of Physics and Astronomy, Clemson University, Clemson, SC (USA)

The relatively simple structure of alkali halide crystals has made these materials the paradigm for the understanding of the dynamics of ionic insulators. We have employed a time-of-flight (TOF) technique to determine the energy loss/gain due to single phonon creation/annihilation events in the scattering of He atoms from the NaCl(001) surface. From these data the surface dispersion curves over the {bar {Gamma}}{ital {bar M}} region of the surface Brillouin zone have been constructed. The results compare favorably with both the slab dynamics and the Green's function calculations reported for this crystal, and with previous measurements in the {l angle}100{r angle} direction. Of particular interest, we report the first evidence for the crossing mode in the {l angle}100{r angle} direction, which had been predicted for NaCl. Additionally, we have employed the TOF technique to examine the Debye-Waller attenuation of the {ital elastic} (specular) intensity and the relative height of an {ital inelastic} multiphonon foot'' at the base of the specular beam as a function of the crystal surface temperature (120--670 K).

• DOE Contract Number: FG05-85ER45208
• OSTI ID: 6769084
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 8:3; ISSN JVTAD; ISSN 0734-2101
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METAL COMPOUNDS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
CHLORIDES
CHLORINE COMPOUNDS
COLLISIONS
CRYSTALS
DEBYE-WALLER FACTOR
ELEMENTS
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
NONMETALS
PHONONS
QUASI PARTICLES
RARE GASES
SODIUM CHLORIDES
SODIUM COMPOUNDS
SURFACE PROPERTIES
TIME-OF-FLIGHT METHOD