Surface-Bulk Correlation Spectroscopy for the Characterization of Ternary Adsorption
Mahsa Torkamanasadi1, Dennis K Hore1,2
1Department of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada.
Abstract:
A method is proposed whereby the range of equilibrium constants that describe how a ternary mixture of molecules is adsorbed onto a solid substrate may be obtained. This information may then be related to the surface preference of a particular species. The technique utilizes infrared and/or Raman spectra of the bulk phase, together with sum frequency generation spectra of the surface in a heterospectral two-dimensional correlation analysis. The method consists of a series of up to three experiments in which the bulk concentrations are varied, followed by a set of rules for interpreting the resulting correlation maps to identify adsorption sequences and surface preference. A scheme is provided to direct the design of the experiments and analyses for such multi-component mixtures.
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