Neutron scattering study of nitrogen adsorbed on basal-plane-oriented graphite

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Neutron scattering study of nitrogen adsorbed on basal-plane-oriented graphite

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Title: Neutron scattering study of nitrogen adsorbed on basal-plane-oriented graphite
Author: Kjems, J. K.; Passell, L.; Taub, H.; Dash, J. G.; Novaco, Anthony D.
Abstract: 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.
URI: http://hdl.handle.net/10385/822
Date: 1976-02-15

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