is the equilibrium bond
length and 
the potential energy
for bond formation and "a" a parameter controlling the width of the potential
well. If we plot the function it looks like:
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Where is the equilibrium bond
length and the potential energy
for bond formation and "a" a parameter controlling the width of the potential
well. If we plot the function it looks like:
Shown as red line is a harmonic fit to the Morse potential around the equilibrium position: showing how, in this case, Hooke's law can be used as a useful approximation.