| Issue |
J. Phys. Colloques
Volume 42, Number C6, Décembre 1981
International Conference on Phonon Physics
|
|
|---|---|---|
| Page(s) | C6-876 - C6-878 | |
| DOI | https://doi.org/10.1051/jphyscol:19816260 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-876-C6-878
DOI: 10.1051/jphyscol:19816260
1 Département de Physique, Université de Sherbrooke, Sherbrooke, Prov. Québec, Canada, J1K 2R1
2 Conseil National de Recherche du Canada, IGM, 750 rue Bel-Air, Montreal, Prov. Québec, Canada, H4C 2K3
3 Brown's University, Providence, R.I., U.S.A.
J. Phys. Colloques 42 (1981) C6-876-C6-878
DOI: 10.1051/jphyscol:19816260
ATTENUATION OF A STATIC POLARIZATION ECHO BY 4He FILM
M. Poirier1, 2, J.D.N. Cheeke1, P. Morisseau1 et A. Hikata31 Département de Physique, Université de Sherbrooke, Sherbrooke, Prov. Québec, Canada, J1K 2R1
2 Conseil National de Recherche du Canada, IGM, 750 rue Bel-Air, Montreal, Prov. Québec, Canada, H4C 2K3
3 Brown's University, Providence, R.I., U.S.A.
Abstract
We have measured by the phonon echo technique the attenuation of an adsorbed 4He film on silica powder against pressure at 35 MHz and low temperatures. The attenuation curves present the typical shape of a multilayer adsorption isotherm of type II according to the BET classification. Because of relatively high RF power no onset of superfluidity has been observed in these films. The attenuation decreases with temperature following the normal viscosity and thermal conductivity contributions to the ultrasonic absorption by 4He.