WETTING OF HE-3-HE-4 MIXTURES ON ALKALI-METAL SUBSTRATES

From available information concerning the wetting behavior of pure He- 3 and pure He-4 on alkali metal substrates, as well as the known prope rties of bulk He-3-He-4 mixtures, the complete wetting phase diagrams for such mixtures, showing prewetting, isotopic separation and lambda transitions for the film phases have been derived. We predict new phen omena such as a triple-point induced dewetting transition, and the abs ence of a superfluid film wetting Cs, Rb and K walls under concentrate d He-3 solutions.