Ultraviolet and visible Brillouin scattering study of viscous relaxation in 3-methylpentane down to the glass transition

Benassi, P.; Nardone, M.; Giugni, Andrea

doi:10.1063/1.4748354

Cited by 2 publications

(5 citation statements)

References 33 publications

(45 reference statements)

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“…The apparent sound velocity, as obtained from the initial slope of these curves, favorably compares with the highfrequency sound velocities inferred from visible and ultraviolet Brillouin spectroscopy [16]. This comparison confirms the role of shear relaxation processes in determining the difference between zero frequency and infinite frequency sound velocities in this system.…”

Section: Introductionsupporting

confidence: 69%

“…7) which well • with 266-nm excitation (black triangles). The full thick line (blue) and the dashed line (red) represent, respectively, the infinite-and zero-frequency limits, as argued from [16]. Diamonds are the transverse velocities measured by Brillouin scattering at 90…”

Section: Resultsmentioning

confidence: 99%

“…• Brillouin scattering spectra measured with 266-nm excitation [16], corresponding to exchanged wave vectors of about 0.05 nm −1 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…6 with sound velocity values reported in a recent paper [16]. In that paper, some of us performed a thorough analysis of both longitudinal and transverse relaxation processes in fluid 3MP analyzing Brillouin spectra at different scattering angles and different excitation wavelengths (532 and 266 nm).…”

Section: Discussionmentioning

confidence: 99%

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Collective excitations in liquid and glassy 3-methylpentane

et al. 2015

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We present a detailed investigation of the terahertz vibrational dynamics of 3-methylpentane performed by means of high-resolution inelastic x-ray scattering (IXS). We probe the dynamics in a large temperature range, which includes the glass, the supercooled liquid, and the liquid phases. The characteristic frequency of the excitations follows a well-defined dispersion curve extending beyond 8 nm −1 at all the investigated temperatures, indicating the persistence of a solidlike behavior also in the liquid phase. This implies the existence of a pseudo-Brillouin zone whose size compares surprisingly well with the periodicity inferred from the first sharp diffraction peak in the static structure factor. We show that, in the investigated temperature range, both sizes undergo a variation of about 15%-20%, comparable to that of the average intermolecular distance. We finally show that the IXS sound velocity coincides with the infinite frequency sound velocity previously inferred from visible and ultraviolet Brillouin spectroscopy data. This analysis confirms the role of the shear relaxation processes in determining the variation with frequency of the apparent sound velocity.

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Section: Introductionsupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

“…• Brillouin scattering spectra measured with 266-nm excitation [16], corresponding to exchanged wave vectors of about 0.05 nm −1 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Collective excitations in liquid and glassy 3-methylpentane

et al. 2015

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“…Since a similar behavior has TABLE I. Physical properties of a 3-methylpentane glass close to T g : v L , longitudinal sound velocity; v T , transverse sound velocity measured using visible Brillouin light scattering; 49 T g , glass transition temperature; 50,51 T m , melting point temperature; ρ, mass density extrapolated below 97 K; 52 n, refractive index as obtained from the Clausius-Mossotti relation; 49 FSDP, the position of the first diffraction peak in the static structure factor.…”

Section: Introductionmentioning

confidence: 95%

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

Baldi

Benassi

Fontana

et al. 2017

The Journal of Chemical Physics

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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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Ultraviolet and visible Brillouin scattering study of viscous relaxation in 3-methylpentane down to the glass transition

Cited by 2 publications

References 33 publications

Collective excitations in liquid and glassy 3-methylpentane

Collective excitations in liquid and glassy 3-methylpentane

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

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