Hydrogen and helium films as model systems of wetting

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1997
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Herminghaus, Stephan
Vorberg, Jens
Gau, Hartmut
Conradt, Robert N. J.
Reinelt, Dietmar
Ulmer, Holger
Przyrembel, Michael
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Annalen der Physik. 1997, 8. Serie, 6(6), pp. 425-447. Available under: doi: 10.1002/andp.19975090602
Zusammenfassung

Optical experiments on the wetting properties of liquid 4He and molecular hydrogen are reviewed. Hydrogen films on noble metal surfaces serve as model systems for studying triple point wetting, a continuous transition between wetting and non-wetting. By means of optically excited surface plasmons, the adsorbed film thickness for temperatures around, and far below, the bulk melting temperature is measured, and the physical mechanisms responsible for the transition are elucidated. Possible applications for other experiments in pure and applied research are discussed. Thin films are droplets of liquid helium are studied on cesium surfaces, on which there is a first order wetting transition. Our studies concentrate on dynamical observations via surface plasmon microscopy, which provide insight into the morphology of liquid helium droplets spreading at different temperatures. Features corresponding to pinning forces, the prewetting line, and the Kosterlitz-Thouless transition are clearly observed.

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530 Physik
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Wetting, surface plasmon, quantium liquids
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ISO 690HERMINGHAUS, Stephan, Jens VORBERG, Hartmut GAU, Robert N. J. CONRADT, Dietmar REINELT, Holger ULMER, Paul LEIDERER, Michael PRZYREMBEL, 1997. Hydrogen and helium films as model systems of wetting. In: Annalen der Physik. 1997, 8. Serie, 6(6), pp. 425-447. Available under: doi: 10.1002/andp.19975090602
BibTex
@article{Herminghaus1997Hydro-8897,
  year={1997},
  doi={10.1002/andp.19975090602},
  title={Hydrogen and helium films as model systems of wetting},
  number={6},
  volume={8. Serie, 6},
  journal={Annalen der Physik},
  pages={425--447},
  author={Herminghaus, Stephan and Vorberg, Jens and Gau, Hartmut and Conradt, Robert N. J. and Reinelt, Dietmar and Ulmer, Holger and Leiderer, Paul and Przyrembel, Michael}
}
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    <dcterms:abstract xml:lang="eng">Optical experiments on the wetting properties of liquid 4He and molecular hydrogen are reviewed. Hydrogen films on noble metal surfaces serve as model systems for studying triple point wetting, a continuous transition between wetting and non-wetting. By means of optically excited surface plasmons, the adsorbed film thickness for temperatures around, and far below, the bulk melting temperature is measured, and the physical mechanisms responsible for the transition are elucidated. Possible applications for other experiments in pure and applied research are discussed. Thin films are droplets of liquid helium are studied on cesium surfaces, on which there is a first order wetting transition. Our studies concentrate on dynamical observations via surface plasmon microscopy, which provide insight into the morphology of liquid helium droplets spreading at different temperatures. Features corresponding to pinning forces, the prewetting line, and the Kosterlitz-Thouless transition are clearly observed.</dcterms:abstract>
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