Hyperthermal scattering of Cs from Pt(1 1 1): the effect of image charge on the ion-surface energy transfer |
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Authors: | S-J HanC-W Lee RJWE LahayeH Kang |
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Institution: | a Department of Physics, Electron Spin Science Center, Pohang University of Science and Technology, Pohang 790-784, South Korea b Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, South Korea c School of Chemistry, Seoul National University, Kwanak-ku, Seoul 151-742, South Korea |
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Abstract: | We have studied the energy exchange between hyperthermal (5-100 eV) Cs+ projectiles and a Pt(1 1 1) surface by measuring the kinetic energy of the scattered ions. The scattering geometry was chosen to be in-plane with specular scattering angles, and the energy of the scattered ions was analyzed as functions of incidence energy and angle. For low incidence energy (<40 eV), the energy transfer to the Pt surface is substantially enhanced due to the attractive image charge force between Cs+ and the surface. The image charge effects are highlighted by the different energy transfer on Pt(1 1 1) and Si(1 1 1) surfaces. Analysis of the experimental results using two- and three-dimensional theoretical models revealed a well depth of 1 eV for the image charge potential. Hyperthermal Cs+ ions scatter from Pt(1 1 1) predominantly via double collisions with Pt atoms, though the scattering phenomena are insensitive to the impact site at the surface. |
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Keywords: | Low energy ion scattering (LEIS) Surface energy Ion-solid interactions Alkali metals Platinum |
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