Electron transfer and energy loss processes in fluorine scattering on oxygen covered Ag(1Â 1Â 0) - Crystal azimuthal dependence

Measurements of energy-losses and electron transfer processes in 1-4 keV fluorine ions and atoms scattering on clean and oxygen covered Ag(1 1 0) were studied. We report data for surface channeling conditions for different surface azimuths for the clean and oxygen covered O(2 × 1)-Ag(1 1 0) (2 × 1) reconstructed surface. Adsorption of oxygen results in strong changes in energy losses and a decrease in the negative ion fraction. Energy loss results are discussed in the light of calculations using non-linear models for stopping power, ab initio crystal structure calculations of the electronic density and semi-classical deterministic simulations.