Kinematics of hyperthermal energy ion scattering. [eV range 100-400]
In this thesis the author analyzes the kinematics of hyperthermal energy (<500 eV) alkali-ion scattering from clean and adsorbate-covered metal surfaces. After describing the equipment used to produce the hyperthermal energy beams, he presents a detailed analysis of energy and angular distributions of 100 to 400 eV Na{sup +} scattered from the clean Cu(110) surface. The spectra are analyzed using classical trajectory calculations. General features of the spectra can be reproduced using a model of the scattering with impact parameters restricted to lie along a chain of surface atoms. Full-surface simulations, including thermal vibrations of the surface atoms, give quantitative agreement with the data. Full-surface simulations are also used to examine the trajectories of ions scattered in-plane and their corresponding impact parameters. He has also analyzed changes in the scattered ion distributions induced by oxygen adsorption on the Cu(110) surface. Cu(110) exhibits a (2 x 1) reconstruction when exposed to oxygen. The changes in the scattering are twofold. First, ions with impact parameters over the second layer copper atoms have direct collisions with the oxygen adatoms, and lose a large fraction of their kinetic energy. Second, the range of final angles is significantly increased for ions with impact parameters over the top layer copper atoms. He has compared the measured scattered ion distributions to calculated spectra using the missing row and buckled row models of the reconstruction. The dependence of the scattered ion energies on the height of the oxygen adatom is also studied.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA)
- OSTI ID:
- 6095439
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Trajectory analysis of low-energy and hyperthermal ions scattered from Cu(110)
Trajectory analysis of low-energy and hyperthermal ions scattered from Cu(110)
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
ION COLLISIONS
SODIUM IONS
COLLISIONS
ADSORPTION
CATIONS
COMPARATIVE EVALUATIONS
ENERGY LOSSES
EV RANGE 100-1000
ION BEAMS
KINETIC ENERGY
OXYGEN
PARTICLE KINEMATICS
POTASSIUM IONS
SCATTERING
SPECTRA
SURFACES
BEAMS
CHARGED PARTICLES
ELEMENTS
ENERGY
ENERGY RANGE
EV RANGE
IONS
LOSSES
METALS
NONMETALS
SORPTION
TRANSITION ELEMENTS
656003* - Condensed Matter Physics- Interactions between Beams & Condensed Matter- (1987-)