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ABSTRACT: The surface dynamics of supported ultrathin polystyrene films with thickness comparable to the radius of gyration were investigated by surface sensitive x-ray photon correlation spectroscopy. We show for the first time that the conventional model of capillary waves on a viscous liquid has to be modified to include the effects of a shear modulus in order to explain both static and dynamic scattering data from ultrathin molten polymer films.
Physical Review Letters 07/2007; 98(22):227801. DOI:10.1103/PHYSREVLETT.98.227801 · 7.51 Impact Factor