Electron transfer processes between sputtered O atoms andAg(110):O(n × 1) reconstructed surfaces

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We present results of a study of sputtered oxygen atom outgoing trajectory dependence ofthe electron transfers with oxidized Ag(110) surfaces reconstructed in different(n × 1) addedrow structures. With a charge state resolved time-of-flight–direct recoil spectroscopy investigation using4 keV Ar+ incident ions, we determine relative yields of sputtered O and Ag atoms as well as the fraction of sputteredO− ions, for different incident polar and azimuthal angles. The relative yields of sputtered Oatoms are satisfactorily reproduced by a classical dynamics simulation. No sputteredAg− ions were detected. A qualitative discussion of the features of the oxygen negative ionfractions suggests that its description needs, in general, to take into account both captureand loss of electrons as the oxygen atom leaves the surface. The experimental data alsosuggest that one needs to correctly describe the corrugation of the surface and that theelectron loss rates should be site-specific.