Figure presents ensemble-averaged interaction energies for the sets of X -(H 2 O) n structures that are considered here, where X -is one of 12 monovalent inorganic anions. Two solvation shells of surrounding water are treated as a single monomer for the purpose of the SAPT calculations. Results are presented both at the quantum-mechanical SAPT0 + MBD/6-311+G(d,p) level [Fig. ] and also using the AMOEBA force field [Fig.