Application of Electron Spin Resonance in the Study of Triplet States. II. Effect of Triplet—Triplet Reabsorption on Quantitative Phosphorescence Measurements

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Abstract
Simultaneous ESR and optical measurements have been made on the rise and decay of triplet molecules for phenanthrene-d10, triphenylene, and naphthalene-d8. The effect of reabsorption of phosphorescence by triplet molecules on kinetic processes involving population and depopulation of the lowest triplet state and on φP/φF ratios is discussed.