Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane

Handle URI:
http://hdl.handle.net/10754/625964
Title:
Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane
Authors:
Baldi, Giacomo ( 0000-0001-8963-3362 ) ; Benassi, Paola; Fontana, Aldo; Giugni, Andrea; Monaco, Giulio; Nardone, Michele; Rossi, Flavio
Abstract:
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.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Physical Sciences and Engineering (PSE) Division
Citation:
Baldi G, Benassi P, Fontana A, Giugni A, Monaco G, et al. (2017) Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane. The Journal of Chemical Physics 147: 164501. Available: http://dx.doi.org/10.1063/1.4998696.
Publisher:
AIP Publishing
Journal:
The Journal of Chemical Physics
Issue Date:
24-Oct-2017
DOI:
10.1063/1.4998696
Type:
Article
ISSN:
0021-9606; 1089-7690
Sponsors:
We gratefully acknowledge the prolific debates and stimulating discussions with the late Professor M. Sampoli who has brought to our attention the interesting phenomenology of this glass-forming liquid.
Additional Links:
http://aip.scitation.org/doi/10.1063/1.4998696
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorBaldi, Giacomoen
dc.contributor.authorBenassi, Paolaen
dc.contributor.authorFontana, Aldoen
dc.contributor.authorGiugni, Andreaen
dc.contributor.authorMonaco, Giulioen
dc.contributor.authorNardone, Micheleen
dc.contributor.authorRossi, Flavioen
dc.date.accessioned2017-10-30T07:55:29Z-
dc.date.available2017-10-30T07:55:29Z-
dc.date.issued2017-10-24en
dc.identifier.citationBaldi G, Benassi P, Fontana A, Giugni A, Monaco G, et al. (2017) Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane. The Journal of Chemical Physics 147: 164501. Available: http://dx.doi.org/10.1063/1.4998696.en
dc.identifier.issn0021-9606en
dc.identifier.issn1089-7690en
dc.identifier.doi10.1063/1.4998696en
dc.identifier.urihttp://hdl.handle.net/10754/625964-
dc.description.abstractWe 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.en
dc.description.sponsorshipWe gratefully acknowledge the prolific debates and stimulating discussions with the late Professor M. Sampoli who has brought to our attention the interesting phenomenology of this glass-forming liquid.en
dc.publisherAIP Publishingen
dc.relation.urlhttp://aip.scitation.org/doi/10.1063/1.4998696en
dc.rightsArchived with thanks to Journal of Chemical Physicsen
dc.titleDamping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentaneen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalThe Journal of Chemical Physicsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDipartimento di Fisica, Università di Trento, 38050 Povo, Trento, Italyen
dc.contributor.institutionDipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell’Aquila, 67100 L’Aquila, Italyen
kaust.authorGiugni, Andreaen
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