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Mean free path (MFP) is an average distance, that an particle (e.g. electrons and ions ) travels within a material between events of a specific type, given by,
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where A - Atomic weight (g/mol)
NA -- Avogadro’s number
ρ -- Density of the material (g/cm3).
σ -- Cross section of scattering (cm2)
NV - The number of scatterers (atoms) per unit volume
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