Article révisé par les pairs
Résumé : The temporary trapping of conduction electrons in surface states may result in singularities in the scattering probability with respect to the incident direction, so-called conduction electron surface resonances, if the conservation of momentum can be satisfied by a, suitable surface structure. We present evidence for the observation of these resonances by means of transverse electron focusing on a Bi single crystal with, an artificially produced grating on the surface.