Abstract
Surface-channeling at grazing incidence of 550 keV protons on electron-bombarded KCl(001) and KBr(001) surfaces is investigated. In order to derive step density of the surfaces as a proportional function of electron-fluence lying in a range below 3×1015 cm−2, intensity distributions (scattering patterns) of reflected protons on a fluorescent screen are observed. With increasing the fluence, the scattering patterns shift to lower scattering angle. The peak-angles of the luminous intensity are compared with calculated results of computer simulations. For both KCl and KBr surfaces, the electron fluence of 1.0×1015 cm−2 is equivalent to the density of monolayer steps of 1.3×105 cm−1 piled upon in the simulation.
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