Abstract
We have observed that the decay rates of rotary spin echoes in the lowest triplet state T 0 of parabenzoquinone (PBQ) and toluquinone (TQ) increase exponentially with the temperature. The activation energy in TQ is equal to the trap depth but in PBQ it corresponds with the energy differences between T 0 and a higher lying vibronic level T e. From the experimental data we obtain the rates for excitation to and decay from this excited vibronic level in PBQ.
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