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    Neutron-diffraction study of the solid layers at the liquid-solid boundary in 4He films adsorbed on graphite

    Carneiro, K.
    Passell, L.
    Thomlinson, W.
    Taub, Haskell
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    [PDF] NeutronDiffractionStudySolidLayers.pdf (1.049Mb)
    Date
    1981
    Format
    Article
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    Abstract
    A neutron scattering study of the structure of 4He films adsorbed on graphite is reported. Diffraction from helium monolayers at a temperature of 1.2 K shows the formation of an incommensurate, triangular-lattice solid of high density. As the coverage is increased above two layers, the diffraction pattern changes indicating solidification of a second layer. The observed two-layer patterns can be indexed with either a pair of incommensurate, triangular-lattice solid layers of different densities or a close-packed bilayer; the experimental information available is not sufficient to make a more precise identification. A measurement of the height of the first helium layer above the graphite basal plane was also made. This was done by determining the coverage-dependent shift in the position of the graphite (002) diffraction peak (assumed to arise from interference between film and substrate scattering) and fitting it to a simple structural model. Values for the monolayer height above the graphite plane and for the lattice constants of the possible bilayer structures are given.
    URI
    http://hdl.handle.net/10355/8842
    Citation
    Phys. Rev. B 24, 1170-1176 (1981)
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    • Physics and Astronomy publications (MU)

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