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Schottky Effect - Practical Electron Microscopy and Database - - An Online Book - |
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| Microanalysis | EM Book https://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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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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| The book author (Yougui Liao) welcomes your comments, suggestions, and corrections, please click here for submission. If you let book author know once you have cited this book, the brief information of your publication will appear on the “Times Cited” page. | ||||||||
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