Low Energy Ion Scattering
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Ion scattering at energies higher than 200 eV has been proved to be a useful tool for analyzing the structure and composition of surfaces. The additional information which can be extracted from ion scattering at energies below 20 eV will be discussed. The results of surface scattering experiments are reported which involve Li+ ions as projectiles and a W(110) and a Ni(100)-surface as targets. High resolution measurements of the energy spectra and the spatial distributions of the backscattered ions are compared with the results of a computer simulation of the scattering process. The computer calculations are based on a scattering model which accounts for single as well as consecutive binary collisions with a chain of surface atoms, the appropriate repulsive interaction potentials, the attractive potential between the ion and the surface due to the image charge in the metal, and the thermal motion of the surface atoms.
With reasonable assumptions as to the actual values of the parameters involved, a very good theoretical prediction of the observed scattering behaviour can be achieved. The measured rainbow structure of the angular distribution is, however, not quite as well reproduced as the form of the energy spectra. This is probably due to the two-dimensional nature of the calculations.
KeywordsAngular Distribution Surface Atom Target Atom Binary Collision Double Collision
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