Lattice dynamics of methane and xenon hydrate:: Observation of symmetry-avoided crossing by experiment and theory -: art. no. 174301

被引:61
作者
Baumert, J [1 ]
Gutt, C
Shpakov, VP
Tse, JS
Krisch, M
Müller, M
Requardt, H
Klug, DD
Janssen, S
Press, W
机构
[1] Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany
[2] Univ Dortmund, D-44221 Dortmund, Germany
[3] Univ Western Ontario, Dept Chem, London, ON N6A 3K7, Canada
[4] Natl Res Council Canada, Steacie Inst Mol Sci, Ottawa, ON, Canada
[5] European Synchrotron Radiat Facil, F-38043 Grenoble, France
[6] Paul Scherrer Inst, Villigen, Switzerland
[7] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
来源
PHYSICAL REVIEW B | 2003年 / 68卷 / 17期
关键词
D O I
10.1103/PhysRevB.68.174301
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The collective dynamics of methane and xenon hydrate in the energy range of +/-20 meV and the Q range of 1.5-11 nm(-1) has been investigated by inelastic x-ray scattering and compared to results from inelastic neutron scattering experiments and lattice dynamical calculations. The experiment focused on the low-frequency phonon dispersion curves that were found to point towards the existence of an avoided crossing between the acoustic lattice phonons and the localized guest modes. The calculations reproduce the experimental spectra and show that the localized vibrations of the guest molecules or atoms are mixed with the collective host lattice vibrations, leading to a damping of the intensity of the acoustic host lattice phonons. This observation supports the idea of a resonant scattering mechanism for the strong guest-host phonon interactions in clathrate hydrates.
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页数:7
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