Dynamical Theory for Energetic Electron-Matter Interaction

Chapter/Index: Introduction | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Appendix

Dynamical Theory for Energetic Electron-Matter Interaction

The periodic potential in crystals causes the amplitude of the accelerating electron (e.g. 200 keV in TEM) to be transferred back-and-forth between the transmitted and diffracted wavefunctions. This transfer process can be explained by dynamical theory. The crystal has a periodic potential that is weak compared with an electron energy of 200 keV.

Table 4135 shows that electrons interact with 1 electron, many electrons, 1 nucleus, and many nuclei in solids.

Table 4135. Effects of interactions of electrons in solids.

	Interaction with electron(s)		Interaction with nucleus/nuclei
	1 electron	Many electrons	1 nucleus	Many nuclei
Scattering type	Inelastic	Inelastic	Quasi-elastic	Elastic	Inelastic
Scattering effect	Electron Compton effect; electron excitation (from 50 eV to a few keV: EDS and EELS)	Plasmon excitation (< 50 eV, ~100 nm TEM specimen); Cerenkov effect	Rutherford scattering; phonon scattering (< 1 eV, heat)	Bragg scattering	Bremsstrahlung

Practical Electron Microscopy and Database

An Online Book, Second Edition by Dr. Yougui Liao (2006)

Dynamical Theory for Energetic Electron-Matter Interaction