ACOUSTIC INTERFEROMETRY IN LIQUID HELIUM FILMS
Identifieur interne : 004F88 ( Main/Exploration ); précédent : 004F87; suivant : 004F89ACOUSTIC INTERFEROMETRY IN LIQUID HELIUM FILMS
Auteurs : C. Anderson ; E. SabiskySource :
Abstract
Optical detection of paramagnetism in solids has been developed into an acoustic phonon spectrometer capable of scanning from 10 to over 300 GHz with an 80 MHz spectral resolution and high sensitivity. One application of this technique has been the detection of simple acoustic standing waves across films of liquid helium adsorbed on cleaved surfaces of CaF2 containing divalent thulium as the paramagnetic ion. In effect this has allowed a scanning acoustic Fabry-Perot interferometer to be operated at acoustic wavelengths of 40-120 Å in liquid helium. The precise determination of the film thickness this provides has produced the best measurements of the van der Waals potential. Operating the system as a modulated Fabry-Perot has enabled the dispersion of the phase velocity of sound in liquid helium to be measured and shown to be positive. In addition it has been possible to measure the phase shift introduced at the crystalliquid helium interface.
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DOI: 10.1051/jphyscol:1972620
Affiliations:
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