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Instrument: TEM : TRANSMISSION ELECTRON MICROSCOPY
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Description
Transmission Electron Microscopy (TEM) are patterned after
Transmission Light Microscopes and will yield similar
information.

Morphology

The size, shape and arrangement of the particles, which make up
the specimen as well as their relationship to each other on the
scale of atomic diameters. Crystallographic Information The
arrangement of atoms in the specimen and their degree of order,
detection of atomic-scale defects in areas a few nanometers in
diameter Compositional Information (if so equipped) The elements
and compounds the sample is composed of and their relative
ratios, in areas a few nanometers in diameter

A TEM works much like a slide projector. A projector shines a
beam of light through (transmits) the slide, as the light passes
through it is affected by the structures and objects on the
slide. These effects result in only certain parts of the light
beam being transmitted through certain parts of the slide. This
transmitted beam is then projected onto the viewing screen,
forming an enlarged image of the slide.

TEMs work the same way except that they shine a beam of
electrons (like the light) through the specimen(like the
slide). Whatever part is transmitted is projected onto a
phosphor screen for the user to see.

[Source: University of Nebraska-Lincoln]