Scanning Electron Microscope
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Uploaded by acmeschool on Jan 11, 2008
A clip for the Acme School of Stuff "Acme Shorts" with David Stringer on how a scanning electron microscope works.
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The technology has indeed been improved greately since this video was taken.
In a TEM it is possible to see the shadows of rows of atoms aligned in a crystal so that it appears that you see single atoms.
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All Comments (42)
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interesting video and very informative
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good 1 it saved my time
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This sounds like a photocathode of an x ray fluoro tower!
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what is a major discovery in science that was discovered using a scanning electron microscope?
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Why did they say you need a TEM to take those pictures when those pictures were SEM pictures???????????? :( that was disappointing to see.
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Really helpful! Thanks!
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"If you think thats disdusting, these are its mouth parts." lol, mouth parts.
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@acmeschool The coating is to make the sample conductive. Some samples are not, and the result might be that you build up a charge on it, where the electron beam hits, and you will burn a hole. Therefore a coating.
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@danster2001 The disadvantage is that you will see things (such as the organizm here) that may give you nightmares.
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i like the part which shows how the signals were turned into an image!
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why it is coated with metal
ahmadassem 1 year ago
@ahmadassem
The metal coating is required to reflect the electron beam.
acmeschool 1 year ago 3
nice vid.
i was wondering, what are the advantages and disadvantages of using a electron microscope?and what can be seen under a electron microscope?
danster2001 2 years ago
Hi Danster,
From memory 20 years ago: The electron microscope can see things that are smaller than a wavelength of light. I think they are seeing actual atoms now, but I haven't kept up on this. One challenge is that the sample has to be made to be electrically conductive, so you can't just stuff any old thing in it.
acmeschool 2 years ago
@acmeschool actually not single atoms (for that you need a Tunneling microscope) but you can see clusters of atoms at the nano size.
italouruguayricano 1 year ago
@italouruguayricano Thank you for the clarificaztion.
acmeschool 1 year ago