Abstract
The effect of a saturating microwave field in resonance with the zero-field levels of an organic triplet state on the triplet-triplet absorption is examined. The change in triplet-triplet absorption intensity is shown to be due to microwave alteration of the over-all steady state population in the lowest triplet state. The microwave-induced intensity changes for triplet-triplet absorption can be calculated in terms of the dynamical rate constants for the individual spin levels of the triplet state. Results of these calculations are compared with experimentally observed triplet-triplet absorption intensity changes for several nitrogen heterocyclic compounds.
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