1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Eletron interference ?

  1. Jul 17, 2010 #1
    When a scanning electron microscope shoots electrons at the material they wish to observe ,
    when the secondary electrons are ejected from the material and then received at the detector
    it seems like electron diffraction might affect the image , But it doesn't seem to , or maybe they got around this some how , ?
  2. jcsd
  3. Jul 17, 2010 #2
    A scanning electron microscope (SEM) produces an image from electrons that are ejected from the very top atomic layer of the sample. The penetration depth is virtually zero.

    Diffraction requires the electrons to travel many lattice units through the sample.

    In fact, diffraction studies are normally only performed using a Transmission Electron Microscope (TEM) where the primary beam travels right through and out the other side.
  4. Jul 17, 2010 #3
    what about a reflection grating ,
  5. Jul 18, 2010 #4
    The electrons don't 'reflect'. It's an inelastic collision with the production of secondary electrons. Phase information is lost
  6. Jul 18, 2010 #5
    ok so why can't the secondary electrons interfere with each other on their way to the detector and produce an interference pattern
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook