Measurement of the surface dynamics of RbCl(001) via high resolution He atom scattering

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)

DOI:https://doi.org/10.1116/1.578400· OSTI ID:6048812

Bishop, G G; Duan, J; Gillman, E S; Safron, S A; Skofronick, J G ^[1]

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1. Departments of Physics and Chemistry and the Materials Research and Technology Center, The Florida State University, Tallahassee, Florida 32306 (United States)

High resolution He atom scattering experiments have been carried out on the cleaved RbCl(001) surface in the [l angle]100[r angle] direction. For most of the experiments reported here the incident He atom wave vector [ital k][sub [ital i]] was [similar to]8 A[sup [minus]1] (corresponding to incident energy [ital E][sub [ital i]][approx]33 meV) and the target temperature was [similar to]190 K. Both the Rayleigh wave and a surface optical mode lying in the gap between the bulk acoustic and optical bands (the [ital S][sub 2] mode) were observed. The measured surface dispersion branches are compared with model calculations of surface dispersion for both a relaxed and an unrelaxed RbCl(001) surface. The calculated Rayleigh mode dispersion is very nearly the same in both models and agrees well with the experimental results. The experimental optical mode data appear to fit the calculations only in part for each model. A comparison of the RbCl results with previously measured KBr surface dispersion curves shows that their dynamics are largely the same, but with significant differences for part of the [ital S][sub 2] mode close to the zone center and for the crossing resonance.

• OSTI ID: 6048812
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 11:4; ISSN 0734-2101; ISSN JVTAD6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
ATOM COLLISIONS
CHLORIDES
CHLORINE COMPOUNDS
COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
MILLI EV RANGE
NONMETALS
RARE GASES
RELAXATION
RUBIDIUM CHLORIDES
RUBIDIUM COMPOUNDS
SURFACE PROPERTIES