Low-Energy Electron Energy-loss Spectra Associated with Reconstructed Structure on Si(111) Surface

Abstract
Low-energy electron energy-loss spectra from the Si(111) surface were obtained under a surface wave resonance condition under which the wave vector of diffracted electrons is parallel to a row of the 1/7-order superlattice rods in 7×7 structure: A peak related to surface dangling bond at 1.5 eV in the energy-loss value Δ E, and a peak due to the excitation of surface plasmon at Δ E=8.5 eV are enhanced at each height. Surface plasmon peak shifts to 10.5 eV when the condition is not satisfied. When the surface changes from a 7×7 structure to a 1×1, the decrease in these peak heights is also observed.