MECHANISM OF DEGRADATION OF THE ELECTRONIC EXCITATION-ENERGY OF DYE-LASER MOLECULES

An increase in the role of nonradiative electron transitions from an excited state of a dye molecule under the action of a resonant electromagnetic field, together with concentration quenching and luminescence depolarisation, indicate the occurrence of a process which can be called induced degradation of an excited state. A model of inter-acting oscillators, which emit radiation and convert the electronic excitation energy to heat, makes it possible to account for the main relationships governing the experi-mentally observed additional quenching. In the first approximation, the general relationships governing the absorption and the concentration effects can be represented in a unified manner and they describe the experimental results with the minimum number of necessary parameters.