High-resolution ellipsometric studies on fluid interfaces.
In this article, highly accurate experimental results reveal the interfacial profile between different macroscopic fluid phases. The deviation from a step profile, quantified by the ellipsometric quantity J(1), shows a strong correlation with the cohesive energy quantified by the Gordon parameter G . Surprisingly, at high values of G , J (1)( < 0) deviates significantly from any predictions. Findings for water and water-like interfaces can be interpreted in terms of the strength of hydrogen bonding at the surface.
Stocco
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Max Planck Institute of Colloids and Interfaces, 14476, Golm, Germany. stocco@lps.u-psud.fr
Tauer
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