The adsorption of ³He-⁴He mixtures on a cesium substrate has been measured near bulk liquid phase separation. A first order wetting transition is found on the bulk three phase coexistence line at Tw0.53 K. The ³He rich liquid phase wets the surface below Tw, and layered films of ⁴He rich liquid under a ³He rich layer wet the substrate above Tw. The surface phase transition line associated with this wetting transition is found to extend to both sides of the bulk coexistence line. On the ⁴He rich side it becomes a line of triple point induced dewetting transitions.
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Ross et al. (1996) studied this question.
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