SLIP AND THE EFFECT OF HE-4 AT THE HE-3-SILICON INTERFACE

We present measurements of the slip of normal He-3 contained between a pair of highly polished silicon plates mounted on a torsional oscillator. The resulting effective viscosity of pure normal He-3 is not consistent with simple slip theory and shows characteristics previously observed only with a surface layer of He-4 present. We have also observed the onset of specularity induced by the addition of He-4. This onset occurs after 2 monolayers of He-4 have been completed and can be associated with superfluidity of the He-4.