1. The problem statement, all variables and given/known data The binding potential energy in a diatomic molecule (N2 for example) is often approximated by the Morse potential energy which has the form U(r) = De (1-e^[-a(r-re)])2 where De is a constant that reflects the well depth (dissociation energy), a is a constant that reflects the width of the well, r is the distance between the atoms, and re is the equilibrium distance. Input an expression for the force as a function of the separation distance (r). 2. Relevant equations F=-du/dx 3. The attempt at a solution F=2a*De*[e^(-2a(r-re))-e^-(a(r-re))] I'm just unsure about the re part. I feel like I'm almost correct.