3.2 the electron microscope Flashcards

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1
Q

what are the advantages of using the electron microscope?

A
  • shorter wavelength have a higher resolving power
  • electron beam could be focused using electromagnets
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2
Q

how does a transmission electron microscope work?

A
  • electron gun produces a beam of electrons and is focused on a specimen by a condenser electromagnet
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3
Q

what are limitations of a transmission electron microscope?

A
  • a vacuum system makes it unable to observe living organisms
  • complex staining process
  • extremely thin specimen
  • man contain artrefacts
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4
Q

what are artefacts?

A

not a part of natural specimen but is resulted from the way a specimen is prepared

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5
Q

how does a scanning electron microscope work?

A

directs beam of electron on the surface and is passed back & forward in a regular pattern

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