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Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane.
Baldi, Giacomo; Benassi, Paola; Fontana, Aldo; Giugni, Andrea; Monaco, Giulio; Nardone, Michele; Rossi, Flavio.
Afiliación
  • Baldi G; Dipartimento di Fisica, Università di Trento, 38050 Povo, Trento, Italy.
  • Benassi P; Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, 67100 L'Aquila, Italy.
  • Fontana A; Dipartimento di Fisica, Università di Trento, 38050 Povo, Trento, Italy.
  • Giugni A; PSE and BESE Divisions, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
  • Monaco G; Dipartimento di Fisica, Università di Trento, 38050 Povo, Trento, Italy.
  • Nardone M; Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, 67100 L'Aquila, Italy.
  • Rossi F; Dipartimento di Fisica, Università di Trento, 38050 Povo, Trento, Italy.
J Chem Phys ; 147(16): 164501, 2017 Oct 28.
Article en En | MEDLINE | ID: mdl-29096506
We report a compared analysis of inelastic X ray scattering (IXS) and of low frequency Raman data of glassy 3-methylpentane. The IXS spectra have been analysed allowing for the existence of two distinct excitations at each scattering wavevector obtaining a consistent interpretation of the spectra. In particular, this procedure allows us to interpret the linewidth of the modes in terms of a simple model which relates them to the width of the first sharp diffraction peak in the static structure factor. In this model, the width of the modes arises from the blurring of the dispersion curves which increases approaching the boundary of the first pseudo-Brillouin zone. The position of the boson peak contribution to the density of vibrational states derived from the Raman scattering measurements is in agreement with the interpretation of the two excitations in terms of a longitudinal mode and a transverse mode, the latter being a result of the mixed character of the transverse modes away from the center of the pseudo-Brillouin zone.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: J Chem Phys Año: 2017 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Estados Unidos
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: J Chem Phys Año: 2017 Tipo del documento: Article País de afiliación: Italia Pais de publicación: Estados Unidos