Journal
CHEMICAL PHYSICS
Volume 328, Issue 1-3, Pages 318-323Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2006.07.016
Keywords
neutron scattering; carbon nanotubes; hydrogen storage; molecular spectroscopy
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Inelastic neutron scattering spectra of para-Hydrogen adsorbed in single-wall carbon nanotubes have been measured at 20 K, at different surface loadings, and at a set of kinematic trajectories. These show the presence of at least two different adsorption sites in the nanotube bundle. Only a weak hindrance to rotation is observed on the more adsorptive site which is preferentially occupied at low H-2 concentrations while a completely free rotation was found at the second and weaker site where the determined centre-of-mass dynamics suggests H-2-H-2 distances similar to those on the graphite surface and in the bulk solid. (c) 2006 Elsevier B.V. All rights reserved.
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