Abstract
The dependence of the forward scattering peak intensity I on Z was considered as the power law I ̴ Zα, and the value of α was discussed. Using the Yukawa potential and the first Born approximation α = 2 is obtained as in the Z2 contrast of the HAADF-STEM. The simulation shows α at Ek = 600 eV and 30 keV are about 1/2 and 1, respectively. Z-dependence of the screening constant could explain α = 1 at Ek = 30 keV. This knowledge of Z dependence will help elemental analysis in photoelectron holography.
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