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RBS spectrum

  1. Nov 30, 2013 #1
    I was given a sample, that it is suppossed to be a medium thickness Rhodium on top of an infinite silicon waffer. The experimental RBS spectrum along with the simulation looks like that

    [​IMG]

    Apparently, there is another element(or maybe 2) that appear on the experimental spectrum.

    I am relatively new to RBS, so I find rather confusing to see two narrow peaks, so close to each other on the substrate part of the spectrum.

    If the waffer wasn't pure, I would expect some steps, rather than peaks. The way I see it, it's an indication of a possible thin and light layer of unknown elements. How to specify which elements could that be?

    Is there also a way to find out if it is really another layer and its position?

    On a second look, it seems that the real spectrum has less events that the simulated, which could be an indication of a non pure Rhodium sample. The question is, which element(s) is responsible for the possible impurity?
     
  2. jcsd
  3. Nov 30, 2013 #2

    mfb

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    Do you see the same peaks without your sample?
    Could that be background from some radioactive material?
     
  4. Nov 30, 2013 #3
    Unfortunately, all I've got is the attached experimental data;nothing else...


    It's a possible scenario, but I doubt if I can prove it with the simulation.

    One thaught, was that the vacuum wasn't well built, so I thought to add a layer of oxygen and nitrus. Unfortunately I couldn't adapt this scenarion to the simulation...
     
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