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Theory

 

In the single scattering model the angular deflections of the electron trajectories are determined only by elastic scattering processes. Historically, the screened Rutherford scattering cross section was used in most of the published programs, although the cross section is not valid for high atomic numbers and low electron energies. Due to these restrictions the Mott cross section is consequently applied within SESAME (see formula A.2).

All inelastic scattering processes are taken into account by the stopping power equation of Bethe. The mean energy loss of an electron between two scattering events is calculated with formula A.3 and formula A.4. The single scattering model is also referred to as the ``Continuous Slowing Down Approximation'' ( CSDA).



Horst Wagner
Tue Mar 19 10:24:55 MET 1996