scanning electron microscope
scanning electron microscope (SEM) A microscope that operates by scanning a finely focused beam of
electrons across the specimen. The reflected electron intensity is measured and displayed on a cathode-ray screen to produce an image. The SEM enables magnifications of up to 100 000 times to be made and provides a much better depth of field than a conventional light microscope (which suffers from focus limitations), making the three-dimensional structure of small objects (e.g.
Foraminiferida) spectacularly visible. In geology it is used extensively for
micropalaeontology, diagenetic studies (see
DIAGENESIS), and
grain textural examination. When coupled with an
electron probe, semi-quantitative determinations of grain chemistry can be made.
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Microscopes made personal: personal electron microscopes provide fast, interactive, high-resolution imaging.(QUALITY TEST & INSPECTION)
Magazine article from: Quality; 4/1/2009; ; 700+ words
; ...determined by the choice of electron source and the accelerating voltage of the electrons. SEMs use one of three types of electron source. Field emission...personal electron microscope. At the other extreme...capabilities of a personal electron microscope can detect...visible ...
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Stamp Vignette on medical science: Ernst Ruska--Inventor of the electron microscope
Magazine article from: Mayo Clinic Proceedings; 2/1/1997; ; 700+ words
; ...be possible. Currently, electron microscopes can produce...greater than those of optical microscopes. In 1931, Ruska built the first electron lens, an electromagnet that focused a beam of electrons just as an optical lens...beam of light. His first electron microscope (1931) ...
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SEMs probe beneath the surface.(scanning electron microscope)
Magazine article from: Test & Measurement World; 7/1/2001; ; 700+ words
; ...the scanning electron microscope (SEM) and the transmission electron microscope...to generate electrons, accelerate...common type of electron microscope used in industrial...focused beam of electrons over a sample...
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STMs create electron-density maps. (scanning tunneling microscope)
Magazine article from: R & D; 6/1/1998; ; 700+ words
; ...Broglie suggested that electrons possessed a dual, wave-like nature, microscope resolution was limited...1930s, the first electron microscopes were based on de...Keefe. In his microscope, light was transmitted...Unlike optical or electron microscopes of the day, O'Keefe's ...
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High resolution/low voltage SEM.(scanning electron microscopes)
Magazine article from: Advanced Materials & Processes; 7/1/1999; ; 700+ words
; ...the operation of the microscope at low voltage without...significant loss in primary electron beam size, brightness...scanning electron microscopes (SEM). In particular...beam size on incident electron energy is shown schematically...the LEO 982 Gemini microscope used for the ...
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Market profile: benchtop electron microscopes.
Newspaper article from: Instrument Business Outlook; 12/15/2007; 700+ words
; ...wave-particle duality, electron microscopes can resolve smaller features, since electrons can be accelerated to energies...course, converting scattered electrons into an image is much more...through an eyepiece. Although electron microscopy has certainly...advantages over optical ...
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Interview: James Hillier, co-inventor of the electron microscope, on the past and present of research in New Jersey
Magazine article from: Business News New Jersey; 11/3/1997; ; 700+ words
; ...to get electron microscopes mass produced...did you invent the electron microscope? Hillier: When...that if you use electrons in a microscope...if you had enough electrons hitting a specimen...very thin, the electrons would go through...we made the first electron ...
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Microscope maps miniscule magnetism. (scanning electron microscope - SEM)
Magazine article from: Science News; 8/24/1985; ; 700+ words
; Electron microscopes are a practical application...matter really do matter. Electron waves are very much shorter...light waves, so using electrons as probes instead of light...can expose. Scanning electron microscopes (SEM) delineate...
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Reportlinker Adds Worldwide Optical, Transmission TEM, and Scanning SEM Electron Microscope Market Shares, Strategies, and Forecasts, 2009 to 2015.
PR Newswire; 10/29/2009; 700+ words
; ...and Scanning SEM Electron Microscope Market...SEM-Electron-Microscope-Market-Shares...before solvable. Microscope markets are segmented as optical microscopes, electron microscopes...Nanotechnology and electron microscopes are a central aspect...had ...
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Reportlinker Adds Worldwide Optical, Transmission TEM, and Scanning SEM Electron Microscope Market Shares, Strategies, and Forecasts, 2009 to 2015 Report.
Business Wire; 10/16/2009; 700+ words
; ...and Scanning SEM Electron Microscope Market...SEM-Electron-Microscope-Market-Shares...before solvable. Microscope markets are segmented as optical microscopes, electron microscopes...Nanotechnology and electron microscopes are a central aspect...had ...
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Electron Microscope, Transmission and Scanning
Book article from: World of Microbiology and Immunology
...the shorter wavelengths of electron beams. TEM offers resolutions...cell structures. Scanning electron microscopes (SEM), instead of being...specimen, are used to observe electrons that are scattered from...irregularities. The scanning electron microscope yields an extremely ...
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electron microscope
Book article from: A Dictionary of Biology
electron microscope A form...uses a beam of electrons instead of a beam...in the optical microscope) to form a large...molecule. In optical microscopes the resolution...High-energy electrons, however, can...for example, electrons accelerated to...The transmission electron ...
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scanning electron microscope
Book article from: A Dictionary of Earth Sciences
scanning electron microscope (SEM) A microscope that...a finely focused beam of electrons across the specimen. The reflected electron intensity is measured and...examination. When coupled with an electron probe, semi-quantitative...
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transmission electron microscope
Book article from: A Dictionary of Biology
transmission electron microscope See electron microscope .
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Microscope and Microscopy
Book article from: World of Microbiology and Immunology
...just a single lens microscope, was able to describe...Leeuwenhoek built over 400 microscopes, each one specifically...made in the light microscope design, mainly...suggested that electrons, as well as other...Experiments on electron beams a few years...the sample, the electron beam ...
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