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Multiphonon scattering of thermal energy He atoms from the LiF(001) surface

Journal Article · · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States)
DOI:https://doi.org/10.1116/1.579148· OSTI ID:7171467
; ; ; ; ;  [1]
  1. Department of Physics, Department of Chemistry, and Center for Materials Research and Technology, Florida State University, Tallahassee, Florida 32306 (United States)
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Results from the scattering of nearly monoenergetic ([Delta][ital E]/[ital E][approx]2%) thermal energy He atoms from the LiF(001) surface are presented and discussed with particular emphasis on multiphonon interactions. These experiments represent the next step in a series of experiments exploring the multiphonon scattering of He from alkali halides in that previous work [G. G. Bishop [ital et] [ital al]., Phys. Rev. B [bold 47], 3966 (1993)] has now been extended to include nonspecular angles. The LiF surface was prepared as in the previous experiments by cleaving the crystal in air and cleaning it by sublimation in the ultrahigh vacuum system. The measurements consist of time-of-flight spectra of the scattered He atoms taken for a number of incident angles as a function of the surface temperature ranging from 290 to 720 K and for He incident wave vectors ranging from 7 to 11 A[sup [minus]1]. Analysis of the data was carried out using a theoretical model developed by Manson [Phys. Rev. B [bold 43], 6924 (1991)], which allows the determination of the interaction potential between the incident atoms and the LiF surface by isolating the scattering form factor. The good representation of the multiphonon scattering found from the model allows this background to be subtracted from the time-of-flight spectra to enhance the single-phonon He atom scattering signal, which in turn permits improved surface phonon dispersion measurements and interpretation.
DOE Contract Number:
FG05-85ER45208
OSTI ID:
7171467
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. 12:4; ISSN 0734-2101; ISSN JVTAD6
Country of Publication:
United States
Language:
English

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Related Subjects

665300* -- Interactions Between Beams & Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ATOM COLLISIONS
COLLISIONS
ELEMENTS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
FORM FACTORS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
INCIDENCE ANGLE
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
NONMETALS
PARTICLE PROPERTIES
PHONONS
QUASI PARTICLES
RARE GASES
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TIME-OF-FLIGHT METHOD