Unfortunately, as we can see even at the smallest cluster size explored, iodine-local stretches and bends are not particularly diagnostic in identifying likely structure using IR spectroscopy. This is likely due to a couple of factors. One of which, is that the iodine containing modes take place at the lower end of the region of wavenumbers that we are able to scan. The power from the laser begins to drop off significantly below 1000 cm -1 , reducing signal to noise, making it difficult to clearly see all features in this region. Second, the binding energy of N 2 is around 800 cm -1 , so peaks below and around this cutoff will not necessarily be well represented within the experimental spectrum. Therefore, for the (1, 0, 1) cluster and the other clusters discussed in the upcoming sections, the ammonium and OH related modes are the most reliable for determining the structure of the clusters.