title: Capillary waves at the transition from propagating to overdamped behavior.
abstract: We measure the dispersion relation of capillary waves on a liquid surface by heterodyne x-ray photon correlation spectroscopy near the transition from propagating to overdamped dynamic behavior. A strong deviation of the propagation frequency from the small-damping result omega(p) proportional, variant k(3/2) is observed long before the actual transition where ( partial differential omega(p)/ partial differential k)<0 and omega(p) tends to zero. This behavior is successfully described by expressions derived within linear response theory.
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France. amadsen@esrf.fr
authors.forename: A
authors.initials: A
authors.lastname: Madsen
authors.forename: T
authors.initials: T
authors.lastname: Seydel
authors.forename: M
authors.initials: M
authors.lastname: Sprung
authors.forename: C
authors.initials: C
authors.lastname: Gutt
authors.forename: M
authors.initials: M
authors.lastname: Tolan
authors.forename: G
authors.initials: G
authors.lastname: Grübel