Vibrational power spectra for the planar systems are shown in Figure . There is a reduction in the lowest frequency modes in the interfacial solvent relative to the non-interfacial region, regardless of gold polarizability. Application of the DR-EAM potential (middle panel) more heavily populates the 300 cm -1 region of the spectrum when compared with the EAM systems, but the effect is quite small. As one might expect, metal polarizability makes some changes to the gold spectrum, but in the planar systems, this consists of a shift of modes from ∼ 100 cm -1 to ∼ 120 cm -1 . At lower frequencies, there appears to be very little motion of the vibrational modes due to polarizability