Another apparent trend in the cluster formation of this solution is the presence of the (x, 1, z ) clusters, where 1 ≤ x = z ≤ 4 (clusters labeled in light grey). This cluster series suggests that not only is iodine pentoxide addition a driving force in cluster growth to larger sizes, but also additional ammonia is crucial in the growth of ammonia/iodic acid/iodine pentoxide clusters. However, since these clusters overall possess significantly lower relative intensities compared to the (3, 2, z ) cluster series and even the (2, 1, z ) clusters, these clusters are presumably less stable. The lack of iodic acid constituents results in fewer interaction sites for proton transfer and salt bridge formation to occur with ammonia, likely resulting in the lower intensity peaks.