Electron microscopy
 
Trapping Pumps/Entrainment Pumps
- 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.
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Trapping vacuum pumps (also called entrainment pumps) are a totally different mechanism to remove air molecules from a chamber. They ionize and accelerate air molecules with high voltage and cause them to attach to the sides of a chamber at high velocity or condense and attach the molecules onto a cold surface. However, they release the air molecules when the pumps are turned off or warmed up. These pumps mainly include ion pumps and cryo-pumps.

The trapping pumps require other type of pumps, typically mechanical pumps, to remove the entrapped molecules from their system.

 

 

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