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ELECTRON MICROSCOPY ( TEM ) - Coursework Example

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c) Yes Based on the answers in Q1. A) and Q1. B) vacuum level of 10-6 torr is adequate to operate a TEM. However, slightly better vacuum will be good for better quality imaging and analytical application.
Q1. d) Better than 10-6 torr vacuum level will help in focussing the…
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Download file "ELECTRON MICROSCOPY ( TEM )" to see previous pages... When high voltage is applied between titanium cathode and an anode, then cold discharge is produced. The electrons are magnetically confined between the electrodes, leading to acceleration of electrons which further ionized the gases between the electrodes. The ionized gases are getted or absorbed in the titanium cathode,
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which is the active material or getter. Besides, titanium also gets sputtered by the ionized gases and the sputtered titanium also absorbs the gases in the region between the electrodes. Thus getting action of titanium leads to evacuation.
This is the rate of evacuation of air molecule. As we know ~80% of these molecules are nitrogen molecules and also that one mole contains 6.023*1023 molecules; the number of molecules of nitrogen getting evacuated will ...Download file "ELECTRON MICROSCOPY ( TEM )" to see next pagesRead More
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Grant proposal+SOP
2. Please type throughout. Print one copy, sign, and send original plus 3 double sided photocopies to YCR, 39 East Parade, Harrogate HG1 5LQ. 3. Email a copy to science@ycr.org.uk – remember to save the form with a meaningful filename. 4. Before completing this form please read the specific Awards Information, Award Conditions and Policies for Awards.
7 Pages(1750 words)Coursework
Electron Microscopy
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4 Pages(750 words)Coursework
Electron Microscopy

Images in TEM are obtained by focusing an electron beam on the specimen. The electrons are absorbed, transmitted, scattered or backscattered. Depending on the kind of image required by the operator, either the transmitted electrons (called direct beam) or the scattered electrons (called diffracted beam) is selected. 

21 Pages(5000 words)Coursework
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From this paper, it is clear that TEM has a large number of applications in innumerable fields ranging from life sciences to material science. TEM has proved to be a priceless tool for studying the ultrastructure of metals (Egerton 2005, 14). In life sciences, it is used for studying bacteria, viruses, and tissues of plants and animals.
5 Pages(1500 words)Essay
Scanning Electron Microscopy

The above micrographs represent a Secondary electron image (SE) and a Backscatter electron image (BSE) of the same region of an asbestos sample.The SE image appears more three dimensional than the BSE image. The cluster of fibers at the center in the SE image appears more rounded, while the one in the BSE appears flat.

15 Pages(3750 words)Coursework
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From this paper it is clear that to obtain such a pattern, the selected area aperture is placed in the image plane of the objective lens and used to select only one part of the image. Using projector lenses to focus on electron beams to obtain small spots on the object surface, the diffraction patterns can be obtained.
20 Pages(5000 words)Coursework
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This essay analyzes that in an electron microscope, the electrons are accelerated in a vacuum until their wavelength is shortened. Shorter wavelengths can be produced by increasing the voltage. Beams of these fast-moving electrons are focused on an object. The object either absorbs these beams and forms an image on an electron-sensitive photographic plate.
17 Pages(6250 words)Essay
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