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I cannot find the equation for this graph.

  1. Nov 7, 2012 #1
    I need it for a program I am writing. I found it all over the net but never with an equation. After two days I'm giving up and hoping someone recognizes it. It doesn't have to be exact I can fix it up but the profile needs to be the same.

    Here it is:
     

    Attached Files:

  2. jcsd
  3. Nov 7, 2012 #2

    symbolipoint

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    That shape looks familiar, but not sure from what exactly. Physics or physical chemistry?

    If you just want a function that fits the graph but you don't really know the mechanism making the shape, try polynomial function fit. Maybe third or fourth degree polynomial can give a good fit. Your graph shows fairly easily readable points. You'll only need the simplest of Linear Algebra skills to determine the function.
     
  4. Nov 7, 2012 #3
    Got it--Morse potential.

    http://en.wikipedia.org/wiki/Morse_potential

    f(x)=e-2x+2-2e-x+1

    Used to model nucleon-nucleon interactions.
     
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