Propylene carbonate reexamined: Mode-couplingβscaling without factorization?

The dynamic susceptibility of propylene carbonate in the moderately viscous regime above Tc is reinvestigated by incoherent neutron and depolarized light scattering, and compared to dielectric loss and solvation response. Depending on the strength of α relaxation, a more or less extended β scaling regime is found. Mode-coupling fits consistently yield λ=0.72 and Tc=182 K, although different positions of the susceptibility minimum indicate that not all observables have reached the universal asymptotics.