Abstract
The effect of a magnetic field on the intensity of fluorescence from chemiluminescent reactions occurring in fluid solutions is calculated. The calculation first considers pairs of triplet molecules rotating in each other's vicinity and calculates the effect of a magnetic field on the rate at which the overall singlet state is populated. The field diminishes this rate, as in the solid-state situation. The triplets are then allowed to diffuse apart, and the process of populating the overall singlet state of the pair is treated as a relaxation process occurring during the diffusive trajectory. In this case too at high fields the intensity diminishes. The calculations are repeated for triplet-doublet quenching, and, in accord with the solid-state results, the intensity is enhanced at high fields because the quenching rate for doublet-triplet collisions is diminished, and the resultant fluorescence arises via triplets which escape abortive D-T encounters. Explicit expressions involving the dynamical parameter...
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