Introduction of Mean Free Path 
- Practical Electron Microscopy and Database -
- An Online Book -  


This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.



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,

                     Mean free path -------------------------------------- [4475a]
                                  Mean Free Path -------------------------------------- [4475b]

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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