Double resonance microwave transitions in intermediate complexes in the annihilation of triplet excitons
Frankevich E.L. , Pristupa A.I. , Lesin V.I.
Using the method of magnetic resonance detected by the change of the reaction yield (RCDMR) at room temperature, we have observed, for the first time ever, two-step microwave transitions between the Zeeman levels of the intermediate two-triplet state produced in the course of annihilation of triplet excitons in anthracene-tetracyanbenzene crystals. The lifetime of this state is 1.4X 10~7 sec.