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Electron transport
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When studying electron transport, there are a very large number of
interactions taking place when an electron is slowing down. A lot of
secondary electrons are also produced during the interactions.
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It would take a very long time to simulate all these events. Instead the
electron’s case history is sampled at different “traveling” points.
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This condensed case history, which gives a macroscopic picture of the
process, takes in each step into account several collisions.
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To minimize the Monte Carlo calculation time the number of steps should
be as few as possible.
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Of great importance is also that the smaller the step size is, the smaller the
net angular deflection and the energy loss are from one step to the next.
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The multiple scattering theories become applicable. When dealing with
interactions close to interfaces a small step size is preferable. A large step
size leads to a larger uncertainty.
Dublin 2018
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