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We investigated the excitation process of surface plasmon at metal surfaces by fast positrons using an energy-filtered reflection high-energy positron diffraction. We measured the positron and electron energy loss spectra for the specular spots from Al(111)-1?1 and Bi(001)-1?1 surfaces at grazing angles. The mean excitation number of surface plasmon by positrons is approximately twice as large as that by electrons. Owing to the existence of the total reflection, the surface plasmons are much excited by positrons as compared with electrons. The element dependence of the surface plasmon excitation process is not significant from the comparison between the Al(111)-1?1 and Bi(001)-1?1 surfaces.

Surface plasmon excitation at metal surfaces studied by reflection high-energy positron diffraction