Electron microscopy
Schottky Effect
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM 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.


For thermal FEGs (field emission guns), electrons are emitted through a reduced potential barrier (reduced by an applied electric field) even when heating the emitter to a lower temperature than the thermal electron emission temperature of 1600 - 1800 K. This phenomenon is also called the Schottky effect. Comparing to cold FEGs, thermal FEGs have disadvantage of large energy spread (0.6 -0.8 eV) because of heating the emitter. However, they have smaller emission noise and produce a stable emission current without gun flashing because there is no adsorption of contamination on the emitters.



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