電子刺激脱離した KBr(001) 表面における高速陽子の表面軸チャネリング

概要

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To demonstrate experimental evidence caused by the lattice strain that was induced by the surface steps introduced by electronic stimulated desorption of ionic-crystals, the ion scattering experiment has been performed. Surface-channeling of protons incident with 5 mrad on an electron-irradiated KBr(001) surface is investigated using a 0.55 MeV beam of protons. The direction of the incident beam is adjusted along the <100> channeling condition and the channeling-dips of the scattering yields are observed. The electron dose-dependence of the minimum yields (χmin) and widths of the dips (φ1/2) are compared with those measured on a KCl(001) surface. For the results of the χmin and φ1/2, results of KBr and KCl show similar dependence on the irradiation dose. For the both surfaces, two small peaks appear in symmetric positions on the channeling-dips. Peak-separations between the two peaks and widths of the peaks increase with the irradiation dose. Although no difference of the lattice strain induced on the two surfaces is detected only by the present experimental results, slight difference between the results for the two surfaces is observed and it is expected to be related with experimental evidence to demonstrate the lattice strain.