Fig. 4: Hydrated protons at a negatively charged fatty sulfate interface.
From: Identifying Eigen-like hydrated protons at negatively charged interfaces
VSF spectrum collected under the SPS polarization combination of a sodium eicosyl sulfate monolayer on a pH 3.8 HCl solution at a constant surface pressure of 2.5 mN m−1 (area per molecule ~65 Å2). Temperature 22 °C. The spectral feature assigned to the hydrated Eigen proton is observed in other negatively charged interfaces besides those involving carboxylic acid moieties.
