Question: Describe how a scanning electron microscope generates a focused electron beam, scans a sample and forms an image. Illustrate the different components of the

Describe how a scanning electron microscope generates a focused electron beam, scans a sample and forms an image. Illustrate the different components of the electron microscope with a labelled diagram. You take a secondary electron (SE) image of a powder and notice that there is a bright band around the edge of the particles. Explain the origin of this bright band After scanning the powder for one minute you notice that the SE contrast of the particles starts to change, with light and dark areas appearing. Some of the small particles disappear altogether. What is happening to your sample, and how can you prevent the changes?

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