Electron Microscopy

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5 Terms

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What are the two types of electron microscopes?

Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM).

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How does a TEM work?

Electrons pass through an ultra-thin specimen; magnetic lenses focus the image onto a screen, producing a 2D image.

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How does a SEM work?

The specimen’s surface is coated with metal (Au/Ag); an electron beam scans the surface and secondary electrons form a detailed 3D image.

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Which microscope provides higher magnification — light or electron?

Electron microscope (×100,000 vs ×1,000 for light).

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Why do electron microscopes have higher magnification?

Because the wavelength of electrons is much shorter than the wavelength of light.