the potential energy of thwo atoms in a molecule can sometimes be approximated by the morse funchtion u=a[(e^(R-r)/s -1)^2-1] where r is the distance...

Find the equilibrium separation ro at which U(r) is minimum. write r=ro+x so so that x is the displacement from equilibrium and show that, for small displacement,U has the approximate from U=const+1/2 kx^2