EXPERIMENTAL APPROACHES TO THE WETTING TRANSITION WITH HELIUM FILMS

被引:31
作者
BIGELOW, N [1 ]
NACHER, PJ [1 ]
DUPONTROC, J [1 ]
机构
[1] UNIV PARIS 06,CNRS,URA 18,F-75230 PARIS 05,FRANCE
关键词
D O I
10.1007/BF00692585
中图分类号
O59 [应用物理学];
学科分类号
摘要
Alkali metal surfaces have been suggested not to be wetted by helium at zero temperature. Several experiments have been realized to check if these surfaces, as well as other weak binding substrates, indeed exhibits this particularly interesting property at any finite temperature. Although works are still in progress, essential results are (i) substrates non wetted by helium films do exist (ii) prewetting jumps from low to high coverage have been observed for weakly wetted ones (iii) the consequences of substrate roughness and chemical impurities are suspected to be important and remain to be assessed. These results are reviewed and discussed. Applications of those substrates for both He-3 and He-4 isotopes are considered.
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页码:135 / 144
页数:10
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