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HIPPO total interaction energies of a) Na-water, b) Cl-water, c) K-water, and d) Br-water are compared against ab initio (ALMO) interaction energy. The interaction energies of Cl-water and Br-water are ~1 kcal/mol greater than that of ALMO, and the leading error is due to HIPPO underestimating charge transfer compared to ALMO. HIPPO charge transfer energies of e) Cl-water and f) Br-water is compared against ab initio (ALMO) charge transfer energy.
