In principal the single scattering model is valid for the simulation of primary electron trajectories for acceleration energies ranging from approximately 1 to 50 keV. The validity of the energy range is limited by the implemented energy loss function, which is the Bethe stopping power in the case of SESAME.
There is no possibility to simulate secondary electrons with the single scattering model. The reason for that being twofold. Firstly, the location of an ionization event and therefore generation of a secondary electron is not exactly known, since ionizations are calculated continuously over the whole electron trajectory. Secondly, many of secondary electrons have energies below 1 keV, an energy where the model is assumed to be not very accurate.
Due to the simplified approximations for the calculation of inelastic
scattering, the authors recommend using this model just for the calculation
of x-ray intensity distributions for overvoltages between 1 and
30. For the reliable simulation of electron trajectories and electron
related physical quantities (e.g. backscattering and transmission of
electrons, secondary electrons,...), the hybrid or direct simulation
model should be used.