Abstract
Experimental observation of the steady-state phosphorescence emission intensity of perdeuterated naphthalene as a function of paramagnetic quencher concentrations has been carried out in solid matrices of ethyl alcohol at liquid-nitrogen temperature. The paramagnetic quenchers chosen for study are the transition-metal ions, Co++, Cr3+, Cu++, and Ni++. The decay curves of phosphorescence are non-exponential, and the deviation from the exponentiality depends on the concentrations of quenchers. The experimental results are correlated and interpreted by using theoretical expressions derived from the Hoijtink's exchange interaction mechanism.
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