BOLTZMANN POPULATION AND SPIN-LATTICE RELAXATION EFFECTS ON THE DECAY OF THE LOWEST TRIPLET STATE OF BENZENE AT $1.4-30^{\circ}\,K$

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1978

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Ohio State University

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The spin sublevel origins of both radiative and non-radiative decays have been $determined^{1}$ for benzene from the temperature dependence of precisely measured phosphorescence lifetimes in several glasses and crystals, in which electron spin-lattice relaxation (SLR) is fast. A more pronounced temperature effect, found in stable cyclohexane, is due to slower SLR. A simplified model and transient time and intensity measurements yield SLR rates whose temperature dependence and behaviors in magnetic fields and under selective microwave irradiation will be seen to support the assumptions of the model.

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$^{1}$ N. G. Kilmer and A. M. Kalantar, Chem. Phys. Letters, 48, 274 (1977), This work was supported, in part, by the National Research Council of Canada. Permanent address of N. G. Kilmer: Hesston College, Hesston, Kansas, 67062.""
Author Institution: Department of Chemistry, University of Alberta; Department of Chemistry, University of California

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