Mechanism of the Effect of a Resonant Microwave Field on Triplet-Triplet Annihilation Between Unlike Triplet Species

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Abstract
The intensity of the DF-ODMR spectrum has been derived when unlike triplets contribute to the annihilation process (heterofusion). Resonant microwave transitions that perturb the spin levels of the triplet pair and of the species diffusing separately (free species) were considered. In the latter case the DF-ODMR signals are negative at any orientation of the magnetic field. The spectra of single crystals of the Diphenylacetylene(DPA)-TCNB complex support the theoretical expectations

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