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TEM Basics

Rotations in the TEM

Electromagnetic lenses cause image rotation and therefore in many microscopes the image will rotate as the magnification is changed.

  1. Measure the rotation between the image and its diffraction pattern by measuring the angle between the [001] and the long edge of the molybdenum trioxide crystal which is known to be [001].

  2. You can see approximately how the image is orientated by navigating to magnification of 1. Try this and determine whether there is a 180o rotation in this case.


1. Explain why there should be a rotation between an image and its diffraction pattern.

2. At what magnification does an extra lens become active (in the simulated microscope)?

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