Abstract
The density profiles of liquid/vapor interfaces of water–alcohol (methanol, ethanol andpropanol) mixtures were studied by surface-sensitive synchrotron x-ray scatteringtechniques. X-ray reflectivity and diffuse scattering measurements, from the pure andmixed liquids, were analyzed in the framework of capillary wave theory to address thecharacteristic length scales of the intrinsic roughness and the shortest capillarywavelength (alternatively, the upper wavevector cutoff in capillary wave theory). Ourresults establish that the intrinsic roughness is dominated by average interatomicdistances. The extracted effective upper wavevector cutoff indicates capillarywave theory breaks down at distances of the order of bulk correlation lengths.
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