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

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    Type
    Article
    Authors
    Baldi, Giacomo
    Benassi, Paola
    Fontana, Aldo
    Giugni, Andrea
    Monaco, Giulio
    Nardone, Michele
    Rossi, Flavio
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Physical Science and Engineering (PSE) Division
    Date
    2017-10-24
    Online Publication Date
    2017-10-24
    Print Publication Date
    2017-10-28
    Permanent link to this record
    http://hdl.handle.net/10754/625964
    
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    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.
    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.
    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.
    Publisher
    AIP Publishing
    Journal
    The Journal of Chemical Physics
    DOI
    10.1063/1.4998696
    Additional Links
    http://aip.scitation.org/doi/10.1063/1.4998696
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4998696
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division

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