Electron beam induced selfconsistent charge transport and secondary electron emission in insulators are described by means of an electron-hole flight-drift model implemented by an iterative computer simulation. Ballistic secondary electrons and holes, their attenuation and drift, as well as their recombination, trapping, and field-dependent and temperature-dependent detrapping are included. As a main result the time dependent secondary electron emission rate and the spatial distributions of currents , charges , field , and potential are obtained. Whereas the switching-on of the secondary electron emission proceeds over milliseconds due to selfconsistent charging, the switching-off process occurs much faster, even over femtoseconds.
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