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I don't understand how to get the temperature from this graph?

  1. Nov 5, 2013 #1
    This is an experiment on plasma control. A graph of current against voltage is drawn on a semi log paper. From this graph, we can get the electron temperature (measured in eV). The method is shown in this picture, but I don't understand it at all. Can someone please explain it to me?
     

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  3. Nov 6, 2013 #2

    CWatters

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    Not my field but looks like they picked two points separated by a factor of 270uA/100uA = 2.7 = e on the vertical scale for convenience.... ln(e)=1

    Something like that anyway.
     
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