MATTER LogoIntroduction to Electron Microscopes

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Scanning Transmission Electron Microscope (STEM) > Overview of the STEM

Description of Flash Animation

This animation shows a simulation of a Scanning Transmission Electron Microscope.

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

Question
The scan is shown greatly exaggerated in this simulation. What would be the actual angle through which the beam would be scanned in a STEM with a lens-specimen distance of 1mm when the imaged area is 1µm square?

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The scanning transmission electron microscope (STEM) is a hybrid microscope which uses the scanning of a very small diameter electron beam to form a transmission image of a thin specimen. Its mode of operation is similar to the SEM, while its images are interpreted in similar ways to TEM images.

Notice that the electron beam travels upwards in this microscope. This is traditional for a dedicated STEM.

Try clicking on either of the two detectors (secondary or transmitted) to see how the image changes.

Question

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