Electron-transfer processes in the interaction of fluorine with a chlorine-covered Ag(111) surface

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Results of a study of changes in electron capture and loss rates in the interaction of fluorine atoms and anions with chlorine-covered Ag(111) surfaces are reported for a wide range of coverages. A strong decrease in F − formation is observed at low-coverage, chemisorption conditions. The magnitude of this decrease shows that electron capture and loss rates are different from those expected on the basis of workfunction changes only. The observed decrease is assigned to changes in local electronic structure at and in the vicinity of the adsorbate site and modifications in positions and widths of the anion levels. At high coverages a higher electron-capture probability is found, corresponding to the appearance of chloride islands.