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Título: | Collective excitations in liquid methanol: A comparison of molecular, lattice-dynamics, and neutron-scattering results |
Autor: | Alonso, J.; Bermejo, Francisco Javier CSIC ORCID; García-Hernández, Mar CSIC ORCID ; Martínez, J. L. CSIC ORCID ; Howells, W. S.; Criado, A. | Fecha de publicación: | 15-may-1992 | Editor: | American Institute of Physics | Citación: | Journal of Chemical Physics 96: 7696-7709 (1992) | Resumen: | The collective dynamics of liquid methanol-d4 is studied by means of molecular-dynamics simulation. The model potential is validated by means of lattice energy calculations and shows a very good agreement with the experimentally obtained crystal structure. Center-of-mass density and momentum fluctuations are investigated in the (Q,ω) region which is also accessible to inelastic neutron-scattering (INS) techniques. A simple viscoelastic model previously used for the analysis of INS data is tested against the dynamic structure factor computed from the simulation. A direct comparison with the INS results themselves is also made and qualitative agreement is found. Also, a tentative assignment of the peaks appearing in the current-current correlations is made on the basis of lattice-dynamics calculations for the polycrystalline low-temperature a phase. © 1992 American Institute of Physics. | Descripción: | 14 pags., 12 figs., 1 tab. 1 app. | Versión del editor: | http://dx.doi.org/10.1063/1.462370 | URI: | http://hdl.handle.net/10261/216176 | DOI: | 10.1063/1.462370 | Identificadores: | doi: 10.1063/1.462370 issn: 0021-9606 |
Aparece en las colecciones: | (CFMAC-IEM) Artículos |
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Collective excitations.pdf | 1,34 MB | Adobe PDF | Visualizar/Abrir |
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