Abstract
An experimental electron gun utilizing an activated negative electron affinity GaAs photocathode has been constructed and installed on a scanning Auger microprobe column. The cathode is operated in the pulsed mode with a dye laser. The electron gun is used to perform time domain metrology with a 100 ps resolution. Use of a high repetition rate short electron pulse photocathode eliminates the need for high frequency beam blanking optics and increases the number of electrons per pulse. The electron pulse shade and duration are predicted by numerically solving the ambipolar diffusion equation which describes the transport of the photoexcited electrons in the cathode structure.
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