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We have performed depolarized Impulsive Stimulated Scattering experiments toobserve shear acoustic phonons in supercooled triphenylphosphite (TPP) from$\sim$10 - 500 MHz. These measurements, in tandem with previously performedlongitudinal and shear measurements, permit further analyses of the relaxationdynamics of TPP within the framework of the mode coupling theory (MCT). Ourresults provide evidence of $\alpha$ coupling between the shear andlongitudinal degrees of freedom up to a decoupling temperature $T_c$ = 231 K. Alower bound length scale of shear wave propagation in liquids verified theexponent predicted by theory in the vicinity of the decoupling temperature.

$\alpha$-Scale Decoupling of the Mechanical Relaxation and Diverging Shear Wave Propagation Lengthscale in Triphenylphosphite