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Low-energy ion-backscattering spectroscopies applied to the determination of surface structure

Thesis/Dissertation ·
OSTI ID:5485205
Low-Energy Ion Scattering (LEIS) was investigated as a means for determining the geometric structure at a single-crystal surface. A three-dimensional Monte-Carlo computer simulation was developed and applied to existing LEIS data. The binary collision approximation was found to yield satisfactory results in simulating Buck's time-of-flight energy spectra for 2.4 keV Ne/sup +/ scattering from Ni(001). A two-atom-layer model was used in calculations of the azimuthal anisotropy of the ion yield measured by Bernheim and Slodzian for 9.5 keV Ne/sup +/ scattering from Cu(001). The calculations were successful in reproducing most of the features that had been observed in the experiments, which shows that this model contained most of the physics required to interpret the data. An apparatus for performing LEIS studies was built, and Low-Energy Ion-Backscattering Angular Distributions (LEIBAD) were collected with 3-20 keV /sup 6/Li/sup +/ incident on Cu(001). For incidence along a low-index Miller axis of the crystal, shadowing effects limited the penetration depth of the elastically scattered ions. However, neutralized Li atoms, which were not filtered out of the scattered yield by the high-pass filter, provided a background characteristic of the bulk. A high-resolution electrostatic analyzer was used to collect impact Collision Ion Scattering Spectroscopy (ICISS) data for 5-keV /sup 6/Li/sup +/ ions to study the Cu(110) and Cu(110) (2 x 1)-0 surfaces.
Research Organization:
California Univ., Los Angeles (USA)
OSTI ID:
5485205
Country of Publication:
United States
Language:
English

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Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR DISTRIBUTION
BACKSCATTERING
BEAMS
CHARGED PARTICLES
COLLISIONS
COMPUTERIZED SIMULATION
COPPER
DISTRIBUTION
ELEMENTS
ENERGY RANGE
ION BEAMS
ION COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
KEV RANGE 10-100
LITHIUM 6 BEAMS
MEASURING METHODS
METALS
MONTE CARLO METHOD
NEON IONS
NICKEL
SCATTERING
SHAPE
SIMULATION
SURFACES
THREE-DIMENSIONAL CALCULATIONS
TRANSITION ELEMENTS