Abstract
Cesium is a surface not wetted by liquid 4 He below a certain temperature, T w ≈ 2K. However, one observes that a thick helium film remains on the Cs substrate even if the surface is cooled below T w from the wetted state. This leaves the question how the system will finally evolve from this metastable state to the thermodynamic equilibrium, represented by a microscopically thin film. We investigate the dynamic and static behavioar of dewetting 4 He films on cesiated surfaces. Space and time resolved measurements of the thickness of the helium film are performed using a surface plasmon microscope. We have measured the work function of pure and oxidized Cs via photo current spectroscopy.
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