Plane Wave of Electron Beam
- Practical Electron Microscopy and Database -
- An Online Book -

http://www.globalsino.com/EM/  



 

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

 

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The plane wave of electron beam propagating in z-direction (optical axis) can be given by,

          Plane Wave of Electron Beam ---------------------- [4203]

where,
         a -- Amplitude
         k -- Wavenumber (=1/λ)
         λ -- Wavelength
         ω -- Frequency

By weakening the strength of the condenser lens (e.g. in TEM), the electron beam incident on the specimen is enlarged so that a wide area on the specimen is covered. That is, the electron beam can be approximately considered as a plane wave incident on the specimen.

 

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