The Dynamics and Structures of Adsorbed Surfaces

M Nielsen, W. D. Ellenson, J. P. McTague

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch


    Reviews neutron scattering work performed on films of simple gas atoms and molecules adsorbed primarily on graphite surfaces. Exfoliated graphite substrates such as Grafoil were first used in this kind of measurements about five years ago and new results have been reported at an increasing pace. Elastic neutron diffraction measurements, determining the two-dimensional structural ordering of the adsorbed films, have been performed on layers of N2, Ar, H2, D2, O2, Kr, and He. Measurements on layers of larger molecules such as CD4 and ND3 have also been reported. Inelastic neutron scattering measurements, studying the dynamics of the adsorbed films are only possible in a few especially favourable cases such as 36Ar and D2 films, where the coherent phonon scattering cross-sections are very large. In other cases incoherent scattering from hydrogen can give information about e.g. the mobility of molecules such as NH3 or the internal modes of adsorbed molecules such as C4H10. Neutron scattering measurements where substrates other than graphite products are used as the adsorbents will not be reviewed here. However, the power of the technique will be demonstrated in an example of H2 physisorbed to activated alumina and in an example where hydrogen is chemisorbed to Raney nickel
    Original languageEnglish
    Title of host publicationProceedings of the Neutron Inelastic Scattering
    Place of PublicationVienna
    PublisherInternational Atomic Energy Agency
    Publication date1978
    Publication statusPublished - 1978
    EventNeutron Inelastic Scattering - Vienna, Austria
    Duration: 16 Oct 197720 Oct 1977


    ConferenceNeutron Inelastic Scattering

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