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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28 October 2017
Research Article|
October 24 2017
Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane
Giacomo Baldi
;
Giacomo Baldi
a)
1
Dipartimento di Fisica, Università di Trento
, 38050 Povo, Trento, Italy
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Paola Benassi;
Paola Benassi
2
Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell’Aquila
, 67100 L’Aquila, Italy
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Aldo Fontana;
Aldo Fontana
1
Dipartimento di Fisica, Università di Trento
, 38050 Povo, Trento, Italy
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Andrea Giugni;
Andrea Giugni
3
PSE and BESE Divisions, King Abdullah University of Science and Technology
, Thuwal 23955-6900, Saudi Arabia
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Giulio Monaco;
Giulio Monaco
1
Dipartimento di Fisica, Università di Trento
, 38050 Povo, Trento, Italy
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Michele Nardone;
Michele Nardone
2
Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell’Aquila
, 67100 L’Aquila, Italy
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Flavio Rossi
Flavio Rossi
1
Dipartimento di Fisica, Università di Trento
, 38050 Povo, Trento, Italy
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a)
Electronic mail: [email protected]
J. Chem. Phys. 147, 164501 (2017)
Article history
Received:
August 02 2017
Accepted:
October 10 2017
Citation
Giacomo Baldi, Paola Benassi, Aldo Fontana, Andrea Giugni, Giulio Monaco, Michele Nardone, Flavio Rossi; Damping of vibrational excitations in glasses at terahertz frequency: The case of 3-methylpentane. J. Chem. Phys. 28 October 2017; 147 (16): 164501. https://doi.org/10.1063/1.4998696
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