Abstract
Single crystals of p-dibromobenzene (DBB) are doped with perdeuterated p-dichlorobenzene, whose triplet energy is slightly above the triplet exciton band of DBB. This gives rise to the formation of DBB X-traps. Optical and ODMR spectroscopy provide evidence that these X-traps are spatially extended. From coherent ODMR experiments we conclude that these X-traps contain more than two molecules forming an energy sink for triplet excitation. The exchange rate for triplet energy between molecules within the sink is at 1.5 K as low as 3 × 10 3 s −1.
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