Abstract
Very-low energy electron diffraction (VLEED) provides useful evidence about the electron band structure of crystal surfaces above the vacuum level. The intensity of the normally incident beam has been measured in detail for Ag(111) in the range 5–35 eV by a low-energy electron microscope. A sharp resonance, as found for Cu(111) [I. Bartoš, M.A. Van Hove, M.S. Altman, Surf. Sci. 352–354 (1996) 660] below the Bragg peak, is connected with the local energy band gap. Good agreement of the I– V curves with theoretical calculations is obtained (in particular the small width of the resonance) when electron channeling along the surface is taken into account.
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