Table 1 Inverse rates (m2/C) of change of the water signal with surface charge density (proportional to the slope at the inflection point) obtained from the sigmoidal fits (see also the Supplementary Materials).

For the MD simulations, the different interfacial regions (Fig. 3B) are distinguished; the SFG experiment corresponds to that presented in Fig. 1B. The errors represent SDs of the fits to the sigmoids.

DiffuseSternWhole rangeSFG experiment
61.0 ± 7.025.2 ± 3.036.1 ± 4.136.1 ± 3.4