Landolt-Börnstein - Group III Condensed Matter Surface structure determination


This chapter describes charge exchange and surface structure determination. The charge state distribution can be calculated theoretically by solving the Anderson-Newns Hamiltonian. Charge exchange experiments are analyzed within the semi-empirical framework. There are three distinct mechanisms by which slow positive ions can capture an electron. The first is Auger neutralization whereby an electron from the highest filled band of the solid tunnels to the lowest empty level of the ion while a second electron from the same band is emitted in order to preserve energy. The second mechanism is resonance neutralization: an electron tunnels from the highest band of the solid to an excited empty level of the ion. This process is followed either by Auger deexcitation or by resonance ionization in which the electron tunnels back to the solid. In the former case, the ion is neutralized and in the latter case, it is re-ionized. The third mechanism (quasi-resonant neutralization) occurs if a core level electron of the solid tunnels to the lowest empty level of the ion. LEIS could be applied for the study of crystal surface structures in the early seventies. Surface shadowing and/or blocking can be applied for surface structure analysis. It is noted that surface structure data can be obtained not only from the intensity of the scattered projectiles but also from the intensity of the recoiled atoms.

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Title Surface structure determination
Book Title
Interaction of Charged Particles and Atoms with Surfaces
In Low energy ion scattering
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Landolt-Börnstein - Group III Condensed Matter
  • G. Chiarotti
  • Authors
  • P. Alkemade
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