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Inelastic neutron scattering and raman light scattering from hydrogen-filled clathrates hydrates (Articolo in rivista)

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Inelastic neutron scattering and raman light scattering from hydrogen-filled clathrates hydrates (Articolo in rivista) (literal)

Anno

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Alternative label

L. Ulivi (1); M. Celli (1); A. Giannasi (1); A J Ramirez-Cuesta (2); M Zoppi (1) (2008)
Inelastic neutron scattering and raman light scattering from hydrogen-filled clathrates hydrates
in Journal of physics. Conference series (Print)
(literal)

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L. Ulivi (1); M. Celli (1); A. Giannasi (1); A J Ramirez-Cuesta (2); M Zoppi (1) (literal)

Pagina inizio

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Dal Joint 21st AIRAPT and 45th EHPRG (European High Pressure Research Group) International Conference on High Pressure Science and Technology, AIRAPT-EHPRG International Conference, Catania, Italy, 17 - 21 September 2007. (literal)

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Rivista

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(Part 4) - Journal of Physics-Conference Series; Dal Joint 21st AIRAPT and 45th EHPRG (European High Pressure Research Group) International Conference on High Pressure Science and Technology, AIRAPT-EHPRG International Conference, Catania, Italy, 17 - 21 September 2007. (literal)

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Note

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(1) ISC-CNR, via Madonna del piano 10, I-50019 Sesto Fiorentino, Italy (2) Rutherford Appleton Laboratory, ISIS Facility, Chilton, Didcot, Oxon, OX11 0QX, UK (literal)

Titolo

Inelastic neutron scattering and raman light scattering from hydrogen-filled clathrates hydrates (literal)

Abstract

Several samples of ternary tetrahydrofuran-H2O-H2 and binary H2O-H2 clathrate hydrates have been analysed by high-resolution inelastic neutron scattering and Raman light scattering. The neutron spectrum presents several intense bands due to H2 molecule excitations and in particular to rotational transitions, centre-of-mass translational transitions of either paraorortho-H2, and to combinations of these. The H2 molecule behaves in the clathrate cage as an almost free rotor, and performs a translational motion (rattling), that 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 is discussed. (literal)

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