Superhalogen properties of BS2- and BSO-: photoelectron spectroscopy and theoretical calculations

We investigate BS2- and BSO- clusters using photoelectron spectroscopy and theoretical calculations. The electron affinities of BS2 and BSO are measured to be 3.80 +/- 0.03 and 3.88 +/- 0.03 eV, respectively, higher than those of halogen atoms. Thus, BS2 and BSO can be considered as superhalogens. The comparison of experimental and theoretical results confirmed that the ground state structures of BS2-, BSO-, and their neutrals are all linear. Analyses of natural bond orbitals suggest that both BS2- and BSO- have dual 3c-4e pi hyperbonds