Comments on the correlation between the Weizsäcker correction and the binding energy of diatomic molecules

Using the double-zeta wavefunctions of Snyder and Basch [5], the Weizsäcker correction $$T_w = \tfrac{1}{8}\int d \vec r(\nabla \rho \cdot \nabla \rho )\rho ^{ - 1} $$ has been evaluated for the molecules H₂, HF, BF, N₂ and CO. There was no linear correlation between T_w and the binding energy for these molecules.