“…For larger sizes, n = 15, 16 and 20, it is very difficult for unbiased global search using GA-DFT method, and some typical 6 structures were modeled based on the geometric structures of small clusters. The isomers of (HgS) n (n = 2-8) and (HgS) n (n = [9][10][11][12][13][14][15][16]20) clusters are plotted in Figure 1 and Figure 2, respectively. Both the three lowest-energy isomers and the isomers with typical motifs, which may be the GM structures of some other clusters, are plotted.…”