Abstract
We have measured adsorption isotherms on a cesium substrate above and below using a quartz-microbalance technique. The results show that the cesium surface remains dry until the pressure almost reaches the saturated vapor pressure. At liquid-vapor coexistence, however, the wetting film continuously thickens to more than 30 layers. Below , the film at coexistence is superfluid. Above , we resolve a feature in the isotherm just below saturated vapor pressure which is characteristic of a prewetting transition.
- Received 21 January 1992
DOI:https://doi.org/10.1103/PhysRevLett.68.2184
©1992 American Physical Society