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

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.

Title	Neutron scattering study of nitrogen adsorbed on basal-plane-oriented graphite
Creator	Kjems, J. K.
	Novaco, Anthony D.
	Taub, H.
	Dash, J. G.
	Passell, L.
Publisher	Physical Review B
Academic Department	Physics
Division	Natural Sciences
Organization	Lafayette College
Date Issued	February 15, 1976
Date Available	2011-03-17T18:29:25Z
Type	Article
Language	English
Bibliographic Citation	Kjems, J. K., et al. (1976). "Neutron scattering study of nitrogen adsorbed on basal-plane-oriented graphite." Physical Review B 13 (4): 1446–1462 .
Standard Identifier	Handle 10385/822
Permalink	http://hdl.handle.net/10385/822
Rights Statement	In Copyright
Rights Holders	The American Physical Society