
Twobeam Dynamical Electron Scattering
 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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Twobeam dynamical scattering theory is also known as the first Bethe approximation that suffices for many purposes. This approximation is an exact solution of the Schrödinger equation for the special case where only one strong diffracted beam presents in the diffraction pattern. For a single crystal, the twobeam dynamical diffraction theory suggests the intensity of an <hkl> diffracted beam given by,
 [2714a]
 [2714a]
where,
I_{0}  The intensity of the incident electron beam,
S  The illuminating area by the incident electron beam,
Φ_{hkl}  Fourier coefficients of an electrostatic potential,
F_{hkl}  The structure factors,
A  The thickness of the crystal in the TEM specimen,
H  The extension of
the reflection in reciprocal space,
σ  The interaction constant between the incident electrons and specimen,
Θ  The half of the angle between the transmitted and scattered electron beams,
ξ_{hkl}  The extinction distance.

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