THE dominant interaction at aqueous interfaces is the hydrogen-bond interaction among water molecules. Despite the influence of hydrogen-bonding on processes at both biological and environmental interfaces, the molecular-level picture for consequences of hydrogen bonding is not yet sharply in focus. Vibrational spectroscopy would seem to be an ideal tool for probing the aqueous interfaces since the OH-stretch frequency shifts by hundreds of wavenumbers upon hydrogen bonding; the precise shift being a sensitive molecular probe of the environment. OH Stretch sensitivity to interactions coupled with the dynamic nature of the surface results in broad, rather featureless spectral features. This contribution will discuss recent efforts to identify resonances at the hydrogen-bonded interface focusing on single-crystal ice and on aqueous ionic solutions. Identification of resonances uses the nonlinear spectroscopy, sum frequency generation, and relies on interferences among polarizations.

Aqueous interfaces: Liquid and solid water plus aqueous salts

245th National Meeting (2013)

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