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NEUTRON SCATTERING MEASUREMENTS OF THE HYDROGEN DYNAMICS IN CLATHRATES HYDRATES.

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Title: NEUTRON SCATTERING MEASUREMENTS OF THE HYDROGEN DYNAMICS IN CLATHRATES HYDRATES.
Author: Ulivi, Lorenzo; Celli, Milva; Giannasi, Alessandra; Zoppi, Marco; Ramirez-Cuesta, A.J.
Subject Keywords gas hydrates;hydrogen clathrates;neutron scattering;Raman spectroscopy.;tetrahydrofuran;hydrogen;International Conference on Gas Hydrates;ICGH
Issue Date: 2008-07
Publicly Available in cIRcle 2008-07-21
Citation: Ulivi, Lorenzo; Celli, Milva; Giannasi, Alessandra; Zoppi, Marco; Ramirez-Cuesta, A.J. 2008. NEUTRON SCATTERING MEASUREMENTS OF THE HYDROGEN DYNAMICS IN CLATHRATES HYDRATES. Proceedings of the 6th International Conference on Gas Hydrates (ICGH 2008), Vancouver, British Columbia, CANADA, July 6-10, 2008.
Abstract: The hydrogen molecule dynamics in tetrahydrofuran-H2-H2O clathrate hydrate has been studied by high-resolution inelastic neutron scattering and Raman light scattering. Several intense bands in the neutron spectrum are observed that are due to H2 molecule excitations. These are rotational transitions, center-of-mass translational transitions (rattling) of either para- or ortho-H2, and combinations of rotations and center-of-mass transitions. The rattling of the H2 molecule is a paradigmatic example of the motion of a quantum particle in a non-harmonic three-dimensional potential well. Both the H2 rotational transition and the fundamental of the rattling transition split into triplets. Raman spectra show a similar splitting of the S0(0) rotational transition, due to a significant anisotropy of the potential with respect to the orientation of the molecule in the cage. The comparison of our experimental values for the transition frequencies to a recent quantum mechanical calculation gives qualitative agreement, but shows some significant difference.
Affiliation: OtherOther
URI: http://hdl.handle.net/2429/1054
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