Introduction

Buchenau, Stéfanie; Weill, Nicolas

doi:10.4000/rgi.338

Cited by 1 publication

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“…The most prominent characteristic of the frequency relaxation spectrum of glass forming liquids is the α peak, a broad, yet distinct feature whose origin lies in the collective degrees of freedom which undergo kinetic arrest during vitrification [1][2][3]. As the transition from liquid to glass occurs either upon cooling or the application of high pressure, the characteristic time scale of α relaxation varies by 16 orders of magnitude, from the ∼100 fs timescale associated with an attempt frequency in the liquid state [4] to the 100 s timescale (arbitrarily) chosen at T g [3]. One of the fundamental tasks presented to the spectroscopy of glass forming liquids is thus the complete characterization of the α relaxation across this span of frequencies.…”

Section: Introductionmentioning

confidence: 99%

α-Scale decoupling of the mechanical relaxation and diverging shear wave propagation length scale in triphenylphosphite

Torchinsky

Johnson

Nelson

2012

The Journal of Chemical Physics

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We have performed depolarized Impulsive Stimulated Scattering experiments to observe shear acoustic phonons in supercooled triphenylphosphite (TPP) from ∼10 -500 MHz. These measurements, in tandem with previously performed longitudinal and shear measurements, permit further analyses of the relaxation dynamics of TPP within the framework of the mode coupling theory (MCT). Our results provide evidence of α coupling between the shear and longitudinal degrees of freedom up to a decoupling temperature Tc = 231 K. A lower bound length scale of shear wave propagation in liquids verified the exponent predicted by theory in the vicinity of the decoupling temperature.

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