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O: Fachverband Oberflächenphysik

O 100: Surface Dynamics II

O 100.4: Talk

Friday, April 4, 2014, 11:15–11:30, PHY C 213

Ultrafast Water Dynamics at the Water-Surfactant-Air Interface — •Ruth A. Livingstone, Mischa Bonn, and Ellen H. G. Backus — Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, 55128 Mainz, Germany

Time resolved spectroscopy has revealed exciting new insights into how energy is transferred in interfacial water. The surfactant SDS (sodium dodecyl sulfate) is an important constituent of cleaning products, and has been widely used as a model in surface and colloidal chemistry. At the water-air interface the SDS solution forms a self assembled surfactant monolayer. Our recent study looks at the interaction of water with SDS at this interface on a molecular level. By using time-resolved two-dimensional sum-frequency generation spectroscopy (2DSFG) we found that there are two distinct types of water present at the air-SDS-water interface. In one type, the water molecules are strongly interacting with the SDS layer; while in the other, the water molecules behave more like bulk water. Interestingly, we observed extremely fast energy transfer between these two different types of water.