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  • Title: Brillouin-scattering study of propylene carbonate: an evaluation of phenomenological and mode coupling analyses.
    Author: Brodin A, Frank M, Wiebel S, Shen G, Wuttke J, Cummins HZ.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2002 May; 65(5 Pt 1):051503. PubMed ID: 12059560.
    Abstract:
    Brillouin-scattering spectra of the molecular glass-forming material propylene carbonate (PC) in the temperature range 140 K to 350 K were analyzed using both the phenomenological Cole-Davidson memory function and a hybrid memory function consisting of the Cole-Davidson function plus a power-law term representing the critical decay part of the fast beta relaxation. The spectra were also analyzed using the extended two-correlator schematic mode-coupling theory (MCT) model recently employed by Götze and Voigtmann to analyze depolarized light backscattering, dielectric, and neutron-scattering spectra of PC [Phys. Rev. E 61, 4133 (2000)]. We assess the ability of the phenomenological and MCT fits, each with three free fitting parameters, to simultaneously describe the spectra and give reasonable values for the alpha-relaxation time tau(alpha).
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