Electron microscopes | Wikipedia audio article
Channel: wikipedia tts
Date: 14/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electron_microscope


00:01:40 1 History
00:04:09 2 Types
00:04:18 2.1 Transmission electron microscope (TEM)
00:08:23 2.2 Serial-section electron microscopy (ssEM)
00:08:53 2.3 Scanning electron microscope (SEM)
00:11:43 2.4 Color
00:14:20 2.5 Reflection electron microscope (REM)
00:15:18 2.6 Scanning transmission electron microscope (STEM)
00:16:21 3 Sample preparation
00:26:24 4 Disadvantages
00:29:24 5 Applications



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SUMMARY
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An electron microscope is a microscope that uses a beam of accelerated electrons as a source of illumination. As the wavelength of an electron can be up to 100,000 times shorter than that of visible light photons, electron microscopes have a higher resolving power than light microscopes and can reveal the structure of smaller objects. A scanning transmission electron microscope has achieved better than 50 pm resolution in annular dark-field imaging mode and magnifications of up to about 10,000,000x whereas most light microscopes are limited by diffraction to about 200 nm resolution and useful magnifications below 2000x.
Electron microscopes have electron optical lens systems that are analogous to the glass lenses of an optical light microscope.
Electron microscopes are used to investigate the ultrastructure of a wide range of biological and inorganic specimens including microorganisms, cells, large molecules, biopsy samples, metals, and crystals. Industrially, electron microscopes are often used for quality control and failure analysis. Modern electron microscopes produce electron micrographs using specialized digital cameras and frame grabbers to capture the images.