Cross relaxation between the spin levels of phosphorescent 1,2,4,5-tetrachlorobenzene and photochemical products of the durene host

At certain magnetic fields, intensity changes have been observed in the phosphorescence of 1,2,4,5-tetrachlorobenzene (TCB) doped in a single crystal oFollowing the application of a magnetic field of the proper magnitude and direction to induce CR, the phosphorescence intensity of TCB displays an obse