Abstract
A photobleaching technique for measuring probe rotational diffusion in supercooled and glassy materials is presented. Rotational correlation times from 10 -2 to 10 +4.5 s have been obtained for tetracene in o-terphenyl (OTP). Relative to the conventional T g for OTP (-30 o C), this corresponds to a temperature range of T g +15 o C to T g -5 o C. These results, combined with nanosecond measurements of anthracene rotation in OTP, are compared to OTP viscosity data. We find that, in contrast to translational diffusion measurements of probes in OTP, rotational diffusion follows the temperature dependence of η/T over the 14 decades of time and viscosity explored
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