Question of Energy Migration in Liquid Benzene and Some of Its Derivatives. II. Studies of Foreign Quenching of Luminescence

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Abstract
Quenching of luminescence of benzene, toluene, p‐xylene, and mesitylene and of their solutions in n‐nonane by CCl4 is studied under conditions of steady‐state and nonsteady‐state uv excitation. An increase of the specific rates of quenching with concentration of aromatic is observed when the data are treated by a simple Stern–Volmer reaction mechanism. Consideration of the presence of excimers in these systems shows, however, that the specific rate of quenching of excited monomers of the aromatics is invariant with concentration. The specific rate of excimer quenching, on the other hand, is found to be concentration dependent. A simple model is suggested to explain the observations, and the validity of the hypothesis regarding energy migration in these systems is discussed.