Sum-frequency spectroscopic studies of mineraL-water interfaces
Glenn A Waychunas, Victor Ostroverkhov, and Y. Ron Shen
Contact: Glenn A. Waychunas, 510/495-2224, GAWaychunas@lbl.gov
Research Objectives
Interactions of water and aqueous solutions with mineral surfaces play an important role in a variety of environmental processes. These processes include soil formation, cycling of chemical elements in nature, mobility of heavy metals and other contaminants as well as nutrients, and surface growth of microorganisms (Brown et al., 1999). Such interactions are affected by solution pH, the presence of dissolved ions , and the surface structure of the solid. The objective of this project is to use available experimental techniques and theoretical approaches to develop a comprehensive microscopic picture of how water and solutes interact with mineral surfaces.
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 Sum frequency vibrational spectra for water on (a) (0001) alpha quartz surface and (b) vitreous silica surface as a function of pH. The lower energy peak is due to ice-like structure water, while the higher energy peak is due to water forming several hydrogen bonds. S
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