Abstract
Light-scattering studies of the liquid-glass transition of ( have been carried out from 305 to 23°C. Composite spectra covering over four decades in frequency were obtained by combining data obtained with a Sandercock tandem Fabry-Pérot interferometer and Raman spectra. Two-step relaxation processes were observed in the supercooled liquid near the glass transition. The α relaxation exhibits a temperature-independent stretching for T> with ≊105 °C, which is about 45°C above the glass transition temperature. The β-relaxation frequency scale indicates critical slowing down when the temperature approaches from either above or below. Scaling analyses for both α and β relaxations provide good agreement with the predictions of mode-coupling theory.
- Received 3 September 1991
DOI:https://doi.org/10.1103/PhysRevA.45.3867
©1992 American Physical Society