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Search for a Fluid Phase in Films of Molecular Hydrogen Isotopes Adsorbed on MgO

  • O. E. Vilches
  • F. C. Liu
  • D. L. Kingsbury
  • J. Ma
  • M. Bienfait
  • J. Suzanne
  • J. M. Gay
  • M. Maruyama
  • P. Zeppenfeld
  • D. Degenhardt
  • H. J. Lauter
  • F. Rieutord
  • G. Coddens
Part of the NATO ASI Series book series (NSSB, volume 257)

Abstract

Films of molecular hydrogen in its various isotopic combinations physisorbed on solid substrates are a fertile ground for studying quantum and dimensionality effects in the substances with the lowest triple point temperatures. The first monolayer of H2, of HD, and of D2 adsorbed on exfoliated graphites have been studied in great detail1–7. The very rich phase diagrams that have emerged from these studies are dominated by two types of solids: one commensurate with the substrate triangular lattice of adsorption sites, the other one (of higher density) incommensurate with the substrate. At lower densities than the one required for approximately perfect commensuration a two-phase coexistence region between a commensurate solid (with vacancies) and its vapor preempts condensation into a liquid, while at densities in between the commensurate and incommensurate solids several types of “domain wall solids” have been proposed, and many of those are observed. Only recently the second and higher atomic layer phases of these molecules have been studied in some detail8–10.

Keywords

Triple Point Liquid Thickness Triple Point Temperature Coexistence Line Quasi Elastic Neutron Scattering 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • O. E. Vilches
    • 1
  • F. C. Liu
    • 1
  • D. L. Kingsbury
    • 1
  • J. Ma
    • 1
  • M. Bienfait
    • 2
  • J. Suzanne
    • 2
  • J. M. Gay
    • 2
  • M. Maruyama
    • 2
  • P. Zeppenfeld
    • 2
  • D. Degenhardt
    • 3
  • H. J. Lauter
    • 3
  • F. Rieutord
    • 3
  • G. Coddens
    • 4
  1. 1.Dep. of PhysicsU. of WashingtonSeattleUSA
  2. 2.CRMC2 and F. des SciencesCampus de LuminyMarseille Cedex 09France
  3. 3.Institut Laue LangevinGrenobleFrance
  4. 4.Laboratoire Léon BrillouinCEN de SaclayGif-sur-Yvette CedexFrance

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