We studied NaSCN(HO) clusters in the gas phase using size-selected anion photoelectron spectroscopy. Vertical detachment energies (VDEs) of NaSCN(HO) ( = 0-6) clusters were obtained in the experiment. Structures of NaSCN(HO) ( = 0-6) clusters and their corresponding neutral counterparts were investigated by theoretical calculations. Our studies show that the Na-NCS type of structures rather than the Na-SCN type of structures are dominant in the gas phase for both anionic and neutral NaSCN(HO) clusters. For NaSCN(HO) anions, the contact ion pair (CIP) and solvent-separated ion pair (SSIP) type of structures coexist at = 2 and 3, the SSIP type of structures become dominant at ≥ 4. For neutral NaSCN(HO), the CIP type of structures are dominant from = 1 to 6 and the SSIP type of structures start to appear at = 6. The gas phase structures in this work support the existence of ion clustering in concentrated NaSCN aqueous solutions.
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