Abstract
We present the first measurements at millikelvin temperatures of both the real and the imaginary parts of the transverse-acoustic impedance of an oscillating surface in contact with dilute solutions of in , as well as with pure with and without a surface boundary layer of . Except for pure , large departures from hydrodynamic behavior are found which are inconsistent with slip theories incorporating specular scattering at the boundary. The effects of the surface boundary layer and of surface roughness are discussed.
- Received 17 February 1987
DOI:https://doi.org/10.1103/PhysRevLett.59.465
©1987 American Physical Society