SEARCH Articles Figures Tables A cross section of the quantity — Ap for N2, Ar2 and F2. We will focus now on the —Ap value, computed in the middle of the internuclear distance. We can see that 7056 even talk about the decreasing of p in the middle of F2, when compared to the sum of densities of the non-interacting atoms. R.F.W. Bader, Atoms in Molecules. A Quantum Theory , Clarendon Press, Oxford, 1994, by permission from the Oxford University Press. [Publishers Imprint]