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Calculating Diffraction Intensities

  1. Aug 30, 2011 #1

    I'll start with the background so perhaps you can understand my problem better.

    I want to write some requirements for diffraction with electrons.

    I know that typically an electron diffraction pattern would need ~1e6 electrons, I could justify this because I also know (and can show that) an image needs 1e8, and a diffraction pattern uses about 100 times less pixels or the beam is 100 times less spread out.

    However I started trying to understand the diffraction process a little more, and I figured it should be possible to calculate the intensity of the diffraction peaks and then I could say something about how many electrons, and the have lots of nice information about the angles etc.

    It seems a little worthless to try and calculate the intensities of an electron diffraction pattern as all the books say the intensities vary too much with thickness etc.

    However because X-rays scatter much less their intensities can be reasonably well calculated and I can find example calculations.
    --I guess that X-ray diffraction patterns and electron diffraction patterns are similar enough that if I can use one to make justifications about the other (on at least an order of magnitude level).--

    So I have all the peaks and intensity for a KCL powder difrraction, great, But what I can not get however is the zero order peak intensity, where nearly 100% of the signal goes.

    Does anyone have any suggestions on this?

    I don't really want to have to use a computer program, as it's nice to have easily manipulatable analytical equations?

    Thanks for your


  2. jcsd
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