α-Scale decoupling of the mechanical relaxation and diverging shear wave propagation length scale in triphenylphosphite
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Nelson_Alpha-scale decoupling.pdf
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Author(s)
Torchinsky, Darius H.
Johnson, Jeremiah A.
Nelson, Keith Adam
Date Issued
May 2012
Journal
The Journal of Chemical Physics
Publisher
American Institute of Physics (AIP)
Citation
Torchinsky, Darius H.; Johnson, Jeremy A.; Nelson, Keith A. J. Chem. Phys. 136, 174509 (2012). © 2012 American Institute of Physics
Version
Final published version
Abstract
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. Our results provide evidence of α coupling between the shear and longitudinal degrees of freedom up to a decoupling temperature T [subscript c] = 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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1063/1.3700756
