Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: POSTER: Micro and Nano Fluidics
CPP 19.7: Poster
Mittwoch, 28. März 2007, 16:00–18:30, Poster B
Thermally Excited Capillary Waves on a Surface Frozen Liquid: A GIXPCS Study — P. Huber1, •M. Wolff1, V. Schoen1, M. Deutsch2, E. Sloutskin2, B. Ocko3, J. Baumert3, A. Madsen4, and M. Sprung5 — 1Universitaet des Saarlandes, Saarbruecken, Germany — 2Bar-Ilan University, Ramat-Gan, Israel — 3Brookhaven National Laboratory, NY, United States — 4European Synrchoton Radiation Facility, Grenoble, France — 5Advanced Photon Source, Argonne National Laboratory, United States
We present results of grazing incidence x-ray photon correlation spectroscopy (GIXPCS) measurements on thermally-excited capillary waves at the free surface of a tetracosane (C24H50) melt as a function of temperature. The measurements have been carried out at the ESRF, Grenoble, France and APS, Argonne National Laboratory, USA.
Upon surface freezing - the formation of a single crystalline monolayer at the melt’s surface, close to, but above the bulk solidification temperature - we find a change both in the damping and in the dispersion relation of the capillary waves.
Our findings on the behavior of microscopic capillary waves, presented here, corroborate earlier results regarding the changes in the dynamics of macroscopic capillary waves upon surface freezing [1].
[1] P.Huber et al., Physical Review Letters 94, 184504 (2005)