Neutron Scattering Study of Nitrogen Adsorbed on Basal Plane Oriented Graphite

Jørgen Kjems, L. Passell, H. Taub, J. G. Dash, A. D. Novaco

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    Thermal-neutron scattering has been used to investigate the structure of nitrogen films adsorbed on Grafoil, a basal-plane-oriented graphite. Diffraction scans were made at coverages between 1/3 of a monolayer and 7/4 monolayers over a temperature range from 10 to 90 K. The observed line shapes were analyzed and found to be generally consistent with the predictions of two-dimensional diffraction theory. From the data at least three distinct surface phases can be identified: (i) a low-temperature epitaxial phase with a triangular lattice structure, (ii) a more compressed low-temperature phase with the same structure but not in registry with the substrate, and (iii) one or more high-temperature disordered phases. Changes in the slope of the adsorption isotherm are found to correlate well with the observed transitions from one phase to another.
    Original languageEnglish
    JournalPhysical Review B
    Issue number4
    Pages (from-to)1446-1462
    Publication statusPublished - 1976


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