Question of Energy Migration in Liquid Benzene and Some of Its Derivatives. I. Self-Quenching Studies

The luminescence of benzene, toluene, p-xylene, and mesitylene and their solutions in n-nonane is studied under conditions of steady-state and nonsteady-state uv excitation. It is shown that the often-used simple reaction mechanism involving only excited monomers cannot account for the results under nonsteady-state excitation. An analysis of the data, which includes formation and reactions of excimers in these systems, is presented.