Abstract
To analyze the inelastic processes of totally reflected fast positrons at solid surfaces, we measured the absolute reflectivity, specular beam profile, and energy-loss spectrum from a $\text{Si}(111)\text{\ensuremath{-}}7\ifmmode\times\else\texttimes\fi{}7$ surface during the reflection high-energy positron diffraction. The absolute reflectivity of positrons was more than 1 order of magnitude greater than that of electrons; however, it was well below 100% even under the total-reflection condition. The specular beam profile of positrons exhibited a broad feature. The energy-loss spectrum showed that more surface plasmons are excited by positrons as compared to electrons. The degraded absolute reflectivity and the broadening of specular beam profile are explained by the multiple surface-plasmon excitations by positrons.
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