Depolarized light scattering spectra of orthoterphenyl were analyzed with both the ide alized and extended versions of mode coupling theory. The idealized MCT analysis gave .. = 0.72 (a= 0.318) and Tc '290 K, in agreement with previous neutron and light scat tering results. The extended MCT analysis gave , = 0.76 (a = 0.30) and Tc ' 276 K, 14 K lower than the idealized result. For the ten spectra at T 2': 320 K where a-peaks were observed, direct KWW fits gave f3K 0.78 with a slight trend of decreasing f3K with increasing temperature. Fits to Ta(T) gave Tc '274 K, close to the extended MCT result. Finally, in an effort to resolve the ambiguity in a-peak fits due to overlap of the a and (3 spectral regions, we performed a combined a- (3 fit to six spectra for T 2 320 K. The results suggest a temperature-independent f3K = 0.79.
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Cummins et al. (1997) studied this question.
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