@article {Lee:70, title = {Direct measurement of the spatial damping of capillary waves at liquid-vapor interfaces}, journal = {J. Phys. Chem.}, volume = {97}, year = {1993}, pages = {12876{\textendash}12878}, abstract = {We measured the spatial damping of low-frequency surface waves at air-water interfaces using a novel heterodyne light scattering technique. For pure water the measured damping agrees well with linear hydrodynamic theory. For interfaces covered with a monolayer of pentadecanoic acid, we find a five-fold increase in damping at a surface concentration of 2.2 molecules nm-2, near the high-density end of the gas/liquid-expanded coexistence region. The behavior of the damping as a function of surface concentration cannot be explained by existing theories.}, author = {K. Y. Christina Lee and T. Chou and D. S. Chung and Mazur, E.} }