short range region. Moreover, they don’t show the expected exponential decay, and increase sharply at longer range. Using a larger unit cell appears to solve these problems: firstly, the radial distributions for the two ions become distinguishable, and show the expected exponential decay. Secondly, the point where the excess electrons start to interfere noticeably is pushed back to a larger distance.\
This type of behavior is seen for all atom types investigated, positive up to neutral ions give the expected radial distributions, while the negative ions seem hampered by the fact that only a fraction of the additional electrons can be attached to the atom. Fluorine and chlorine are in this respect exceptional since for these atoms also the F$^-$ and Cl$^-$ ions give good distributions and populations. This could be considered a result of the high electron affinity of these elements.\
We find that for most negatively charged ions the populations are too small. As a result, the calculated Hirshfeld weight  for a negatively charged AIM A is underestimated. The easiest way to compensate for this discrepancy is by scaling these specific distributions such that the correct population is found after integration. This way the shape of the curve 