Inelastic Neutron Scattering of H2 in Xerogel |
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| Authors: | D. G. Narehood N. Grube R. M. Dimeo D. W. Brown P. E. Sokol |
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| Affiliation: | (1) Department of Physics and Materials Research Institute, Pennsylvania State University Park, Pennsylvania, 16802;(2) NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899;(3) Materials Science Division, Los Alamos National Lab., Los Alamos, New Mexico, 87545 |
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| Abstract: | The properties of molecular hydrogen adsorbed in Britesorb were studied through inelastic neutron scattering. We have measured both the rotational energy levels and the momentum distribution at bilayer and nearly full pore fillings. Splitting of the J=1 rotational energy levels is observed for molecular hydrogen adsorbed on the surface, while the rotational properties of the hydrogen adsorbed after monolayer completion is consistent with behavior in the bulk. Additionally, the measurement of the momentum distribution showed that the mean kinetic energy of the molecules in the bilayer is 88 K±7 K. The kinetic energy measured in the nearly full pore was 81 K±6 K, which is consistent with a simple model in which the behavior of the monolayer is dominated by the interaction with the surface of the pore wall but H2 adsorbed after monolayer completion is bulk like. |
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| Keywords: | xerogel inelastic neutron scattering kinetic energy |
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