Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electron microprobe

  1. Sep 19, 2003 #1
    They are used in Geology, archaeology and materials science and are not simply an SEM or TEM.

    Anybody using one? Know good sources of info beyond Google searches? I know nothing about them yet but hope to soon.
     
  2. jcsd
  3. Oct 10, 2003 #2
    maybe you mean

    AFM ?
     
  4. Oct 12, 2003 #3
    Nope,

    I have access to an Atomic Force Microscope. It's not the same as an Electron Microprobe at all. EMP uses an electron beam and can do analysis of elements that are present.
     
  5. Oct 12, 2003 #4
    in our lab

    the SEM tells you what elements are present. I think it's an EDS that recognizes the elements.
     
  6. Dec 31, 2003 #5
    Since no one seemed to know about this I went off and answered the question myself. Electron Microprobes and SEM's are very similar. They differ in the purpose they are optimized for.

    SEM's are optimized for imaging but typically have an Energy Dispersive Spectroscope for analysis down to 1000 ppm and 135 eV resolution of spectra.

    EMPA is optimized for chemical analysis using Wavelength Dispersive Spectroscopy for high resolution and low concentration analysis. It can still do images with Backscattered and Secondary electrons but not as high resolution as an SEM. Since WDS is very slow, EMPA uses 5 or 6 WDS units in parallel with 30 ppm sensitivity and 3 eV resolution.

    EMPA's are a major tool in geology so I guess that's why there are no users in this forum.
     
  7. Jan 9, 2004 #6

    enigma

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    I'm moving this to the Earth Science forums, since the device is primarily used by geologists. Maybe someone there has more information for you.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?