SURFACE ELECTRONIC STATE EFFECTS IN ELECTRON EMISSION FROM METAL SURFACES

C. D. ARCHUBI; M. N. FARAGGI; V. M. SILKIN; M. S. GRAVIELLE

Workshop; 20 th International Workshop on Inelastic Collisions; 2014

The influence of the electronic band structure on electronemission spectra produced by grazing collisions of protonswith metal surfaces is studied considering high incidencevelocities. The electron emission process from the valenceband is described within the Band-Structure-Based (BSB)approximation [1], which is a binary collisional method thatincludes an accurate representation of the electron-surfaceinteraction, given by the model potential of Ref. [2]. Thispotential incorporates information about the band structureof the solid, reproducing properly the projected energy gapand the energies of the surface and first image states.In a previous work [1] the BSB approximation was appliedto study electron emission induced by incidence of swiftprotons on a Be(0001) surface. It was found that thedistribution of ejected electrons presents noticeable signs ofthe surface band structure, with pronounced shoulders dueto the contribution of partially occupied surface electronicstates (SESs). In this work the research is extended toconsider electron emission from Cu(111), Ag(111), Au(111)and Mg(0001) surfaces, for which it is foreseeable that bandstructure effects leave footprints on the electron emissionspectra due to the presence of strongly localized surfacesstates.