Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 12: Postersitzung (Struktur und Dynamik reiner Oberfl
ächen, Grenzfl
äche fest-flüssig, Nanostrukturen, Teilchen und Cluster, Halbleiteroberfl
ächen und Grenzfl
ächen, Zeitaufgelöste Spektroskopie, Rastersondentechniken, Methodisches)

O 12.6: Poster

Montag, 24. März 2003, 18:00–21:00, P1

Surface XPCS measurements of water-glycerol mixtures — •Michael Sprung¹, Robert Fendt¹, Christian Gutt¹, Metin Tolan¹, Anders Madsen², and Tilo Seydel³ — ¹Experimentelle Physik I, Universitaet Dortmund — ²ESRF, Grenoble, France — ³ILL, Grenoble, France

Surface XPCS experiments allow to determine the dynamical properties of liquid surfaces. Surfaces of liquids are covered by capillary waves, leading to an intrinsic rms roughness of a few Angstroem. Basic hydrodynamics leads to two different kinds of surface waves: propagating waves for low viscosity and overdamped modes for high viscosity liquids. Mixtures of water and glycerol allow to tune the value of the viscosity and therefore to study the transition between these two different modes. We present recent XPCS data taken at the ID10 B beamline at ESRF, Grenoble.