@article{Semiempirical investigations on the stabilization energies and ionic hydrogen-bonded structures of F−(H2O)n and Cl−(H2O)n (n = 1–4) clusters_2023, volume={7}, url={https://oiccpress.com/journal-of-theoretical-and-applied-physics/article/semiempirical-investigations-on-the-stabilization-energies-and-ionic-hydrogen-bonded-structures-of-f%e2%88%92h2on-and-cl%e2%88%92h2on-n-1-4-clusters/}, DOI={10.1186/2251-7235-7-7}, abstractNote={AbstractSeveral semiempirical methods were utilized to analyze the structures and stabilities of X−(H2O)n (X = F, Cl; n = 1–4) clusters with respect to the number of water molecules through their comparison with ab initio molecular orbital calculations. Our results show that the recently developed PM6-DH+ semiempirical method can provide reasonable binding energies of hydrated fluoride and chloride ion clusters, which are consistent with the corresponding experimental results. For the optimized geometries of X = F, however, the semiempirical methods show that the global minima are close to HF(OH)−(H2O)n−1 structures, which are different from the ab initio calculations. Meanwhile, the topological characteristics for the global minima of X = Cl obtained by semiempirical methods have the same symmetries with ab initio calculations. All calculation levels agree on the trend of decreasing ion-water interaction with the increasing number of water molecules. We also found a new structure of Cl−(H2O)4 with a second hydration shell as a complement of previous studies. Those are very important data for our near-future study of on-the-fly semiempirical molecular dynamics (MD) or path integral MD simulation.PACS36.40.Mr, 31.15.bu, 31.15.A-}, number={1}, journal={Journal of Theoretical and Applied Physics}, publisher={OICC Press}, year={2023}, month={Nov.}, keywords={Bonded structures, Halide anion water clusters, Ionic hydrogen, Molecular orbital calculations, Semiempirical potential} }