Electron Microscopy Essay
TEM
Transmission Electron Microscopy
Introduction
Transmission Electron Microscope is a type of electron microscopy that forms detailed images called micrographs. (David B. Williams et al, 1996) states that the images form by passing a beam of electrons through a very thin slice of the area of interest. The transmission electron microscope operates on the same principles as the light microscope but uses electrons instead of light. What we see with a light microscope is limited by the wavelength of light. Transmission electron microscope use electrons as light source and their lower wavelength make it possible to get a resolution a hundred times better than with a light microscope.
In this work, I’ll focus mainly on the discovery of the technique,
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He developed the first electromagnetic lens, which focused a beam of electrons in lieu of an illuminator onto a source to create a magnified image (Richard.D Patrick, 2012).
Development of the technique
The basic components of the transmission electron microscope (TEM) have not changed substantially since the late 1940s. The electronic circuitry however has changed significantly from pre-transistor electronics of the first microscopes to the sophisticated modern machines that permit remote operation of nearly all microscope functions.
There has been a steady improvement of the quality of the main lenses in the microscope, the stability of high voltage and lens currents and an increased theoretical understanding of lens aberrations and how they can be corrected. This evolution continues to date.
Aberration corrected transmission electron microscopy for application in the nanotechnology field (Richard.D Patrick, 2012: 89). This improved spatial resolution means that a greater number of lattice planes are resolvable for any material. For randomly orientated nanoparticles this has the benefit that lattice information is resolved for a greater fraction of the
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