The reorientation of a nearly spherical paramagnetic tracer dissolved in supercooled o-terphenyl is studied by electron spin resonance in the range 200 K < T < 370 K. For T > 300 K the rotational correlation time tau(2) follows the Debye-Stokes-Einstein law. On decreasing the temperature, the rotational motion of the probe and the viscosity eta decouple. In particular, in the region around T = 290 K it is found that tau(2) proportional to (eta/T)xi with xi = 0.28 +/- 0.04.
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Andreozzi et al. (1996) studied this question.
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