Light scattering measurement of shear viscosity in a fragile glass-forming liquid, metatoluidine

We have measured and analyzed, through a new theoretical approach, the appearance with decreasing temperature of transverse acoustic waves in the supercooled liquid, metatoluidine. Our approach allows us to determine, at each temperature, solely from the light scattering spectra, the dynamical shear viscosity, η s ( T ,ω), from which its zero-frequency limit, η s ( T ,0), can be deduced. The limit agrees with the static shear viscosity, measured directly in static experiments, between 0.07 Pa s and 2 Pa s, but the two values start to deviate above 2 Pa s.