Abstract
Hans Bethe in 1966 theoretically predicted the shadowlike diffraction effects in the forward (θ ≈ D – 1°) elastic scattering cross sections of low-energy electrons off atoms such as He, Ne, and Ar and explained them as being due to the coupling of inelastic scattering channels. By scattering 10-25-eV electrons off Ne in the forward direction (θ up to 20 mrad), Geiger and Moran1 found the diffraction effects (superimposed on the Born approximation). This shadow diffraction occurs not at the atom edge (radius γ0) but at the sheath surrounding (radius R) the atom due to agglomeration of the inelastic scattered electrons.
© 1987 Optical Society of America
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