Benzene has delocalized electrons that are free to move around the aromatic ring (ring radius = R). There is a steep potential energy well restricting them from leaving the ring. The potential energy is zero when the electrons are in the ring, and can be assumed to be infinite when they are outside the ring. In cylindrical coordinates, the potential energy is: V (r, 0, z) = 00 when r # R orz # 0 and V (R, 0, 0) = 0 for any value of 0 (0