Abstract
We have studied the spin-lattice relaxation (SLR) in the lowest triplet state of naphthalene present as a guest in a durene host from 2 to 4 K. From the temperature dependence we obtain strong evidence that in this system SLR, within the lowest triplet state, is determined by phonon absorption to nearby vibronic states. This description is supported by the occurrence of a hot band in the phosphorescence spectrum and by the results of electron resonance experiments in zero field, which show a temperature dependence of the resonance frequency of the zero-field transitions.
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