1 Electron Microscope (EM) Lab-2- Sunday 13/12/2015 An electron microscope is a type of microscope that uses a beam of electrons to illuminate the specimen and produce a magnified image. Electron microscopes (EM) have a greater resolving power than a light-powered optical microscope , because electrons have wavelengths about 100,000 times shorter than visible light (photons ), and magnifications of up to about 10,000,000x, whereas ordinary. The electron microscope uses electrostatic and electromagnetic "lenses" to control the electron beam and focus it to form an image. These lenses are analogous to, but different from the glass lenses of an optical
19
Embed
· Web view2-Scanning Electron Microscope (SEM) Unlike the (TEM), where electrons of the high voltage beam carry the image of the specimen, the electron beam of the scanning electron
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Electron Microscope (EM)
Lab-2-
Sunday 13/12/2015
An electron microscope is a type of microscope that uses a beam of
electrons to illuminate the specimen and produce a magnified image.
Electron microscopes (EM) have a greater resolving power than a light-
powered optical microscope, because electrons have wavelengths about
100,000 times shorter than visible light (photons), and magnifications of
up to about 10,000,000x, whereas ordinary.
The electron microscope uses electrostatic and electromagnetic
"lenses" to control the electron beam and focus it to form an image.
These lenses are analogous to, but different from the glass lenses
of an optical microscopes that form a magnified image by focusing
light on or through the specimen.
Electron microscopes are used to observe a wide range of
biological and inorganic specimens including microorganisms,
cells, large molecules, biopsy samples, metals, and crystals.