Abstract
We present a survey of the wetting behavior of 4 He on evaporated films of rubidium, potassium and sodium. 4 He wets these surfaces at all temperatures. Off coexistence on rubidium and potassium there is a prewetting transition that is closely coupled with superfluid onset and possibly a surface tricritical point where the prewetting transition and superfluid onset intersect. Sodium has a prewetting critical temperature well below 1 K. Wetting and superfluid onset phase diagrams for 4 He on rubidium and potassium are presented and compared with that of 4 He on cesium.
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