Fig. 6. Differences in the charge density between the Au + water system, a parallel plate capacitor and an isolated H2O molecule submitted to an equivalent electric field for (a) V = 1.5 V, (b) V = 0, and (c) V = –1.5 V. An isosurface value of ±8.4 × 10–3 e per Å3 was considered in all of the plots, where red (blue) indicates an excess (deficiency) of electrons.
