The Formation and Electronic Relaxation of Intermolecular Exciplex in the Vapor Phase

Abstract
The intermolecular exciplex formation and electronic relaxation of 1,4-dicyanonaphthalene (DCN) with pentamethylbenzene (PMB) in the vapor phase have been studied by means of nanosecond fluorescence spectroscopy. The exciplex formation and decay-rate constants were independent of the excitation energy, while the decay-rate constants of DCN fluorescence was dependent on the excitation energy. The rate constants of the exciplex formation and decay kinetics were discussed in comparison with the collisional relaxation rate of the upper vibrational states.