The goal of this paper is to compare the results of geometry optimizations done at different levels of theory. However, different methods might end up in different optimized geometries/configurations and this would lead to a skewed comparison. Hence, in the fol-lowing sections (Section 2.3 and Section 2.4) we will give a description of the methods used to distinguish between different configurations, such that we in Section 3 can directly compare clusters which have actually been optimized to the same minimum geometry.