Abstract
The phenomenon of atomic mixing due to the impact of energetic ions is described by a model based upon the theory of random flights. The transport of material is shown to be formally analogous to standard diffusion theory. The formal diffusion constant is derived from first principles using power law potentials and the result of elementary range theory. An approximate formula is given, which is valid for dilute impurity transport in an otherwise homogeneous host matrix. Comparison is made to experimental results of ion irradiation.
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