Dielectric relaxation measurements on supercooled triphenyl phosphite show that time-temperature superposition (TTS) is obeyed for the primary relaxation process at low temperatures. Measurements on other molecular liquids close to the calorimetric glass transition indicate that TTS is linked to an ${\omega }^{-1\mathrm{}/2}$ high-frequency decay of the loss, while the loss peak width is nonuniversal.

• Received 12 June 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.1271

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