Translational vibration modes—The spectral signature of excess proton transport in water

The water molecular arrangement associated with proton transport was investigated using a water bridge structure in electric field Ē intensities of approximately 106 V/m. Excess protons in a moderate electric field induce a water molecular transport in a formed pathway at the water/air interface. This interfacial structural arrangement was characterized by its Raman spectrum assigned for modes in the translational lattice vibration region. By comparing the intensities of translational mode intensity for interfacial water (|Ē|=0) and in water bridges with excess proton transport (|Ē|≠0), the water molecular configuration change is determined. Interfacial water structural induced changes were also measured by contact angle variation.