Abstract
Abstract The decay of the phosphorescence of naphthalene in the mixed solutions of methylcyclohexane and several chlorinated compounds has been analyzed. In many cases the decay was almost exponential and the decay constant was a function of the concentration of chlorinated compounds. In the case of carbon tetrachloride, the decay was distinctly non-exponential. The decay was analyzed by a Laplace transformation method. In this case a complex was formed, in equilibrium with the free naphthalene molecule, and the decay constant of the former increased when the concentration of CCl4 increased. The external heavy atom effect takes place in two ways: one by complex formation with the molecule containing heavy atoms and another by a long range interaction through a statistical distribution of the latter molecules around the phosphorescing molecule.
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