MATTER LogoIntroduction to Electron Microscopes

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Transmission Electron Microscope (TEM) > Electron gun

Description of Flash Animation

This animation shows diagrams of the thermionic electron gun (the most commonly used) and the field emission gun.

This resource requires Flash Player 9 or above available to download from http://www.adobe.com/go/getflash

The function of the electron gun is to provide an intense beam of high energy electrons.

There are two main types of gun: the thermionic electron gun (the most commonly used) and the field emission gun.

Click opposite to display the diagram of each gun.

Question

Question
How many electrons per second are carried in a beam with current 1mA?

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