I cannot find the equation for this graph.

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The discussion centers on finding an equation for a specific graph needed for a programming project. The original poster has struggled to locate the equation online and is considering giving up. Suggestions include using a polynomial function fit, particularly a third or fourth degree polynomial, to approximate the graph's shape. The Morse potential is identified as a possible match for the graph, which is relevant in modeling nucleon-nucleon interactions. The conversation emphasizes the use of basic linear algebra skills to derive the fitting function.
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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:
 

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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.
 
Got it--Morse potential.

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

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

That shape looks familiar, but not sure from what exactly. Physics or physical chemistry?
Used to model nucleon-nucleon interactions.
 

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