Due to the fact the atoms in an amorphous material are approximately equally distributed a simple fast algorithm can be applied, because only the material density has to be considered by assuming that a cylinder with a radius of the maximum impact parameter and a length of the average free flight path contains only one target atom. The average free flight path can then be calculated by
The maximum impact parameter is determined by the particle density.
Besides the position of the collision partner its material type has to be determined. The stoichiometry of the target material defines the probability for finding certain atom species in the material. Accordingly the type of the collision partner is selected randomly just considering this probability distribution. Thereby correlation effects due to the molecular structure in the material are neglected, but due to the large number of collisions all correlation effects are averaged.
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