Helium prewetting and nonwetting on weak-binding substrates

E. Cheng, Milton Walter Cole, W. F. Saam, J. Treiner

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Abstract

New wetting and nonwetting phenomena for He4 adsorbed on weak-binding substrates such as the alkali metals are predicted. With a nonlocal density-functional model, we calculate the density profile of He4 films adsorbed on surfaces characterized by an attractive van der Waals potential tail of strength C3 and a well depth D. As a function of C3 and D, He4 films exhibit both nonwetting and wetting, the latter being accompanied by a prewetting transition. Specifically, we find that He4 will not wet all the alkali metals; only on Li and Na is wetting behavior, with prewetting, expected.

Original languageEnglish (US)
Pages (from-to)1007-1010
Number of pages4
JournalPhysical Review Letters
Volume67
Issue number8
DOIs
StatePublished - Jan 1 1991

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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