Regularities of the formation of the photolysis products in the lead azide-cadmium system

Compared to PbN₆(Ab), the PbN₆(Ab)-Cd system was found to be characterized by a low photolysis rate within the region of intrinsic absorption of PbN₆(Ab) and, at the same time, by a broader range of spectral sensitivity of PbN₆(Ab), up to 510 nm. Preliminary irradiation by 380-nm light resulted in an increase in the photolysis rate. The photolysis rate constants for the PbN₆(Ab)-Cd system were determined. An analysis of the voltammetric characteristics, photocurrent, and contact potential difference made it possible to develop a model of the photolysis of the PbN₆(Ab)-Cd system, including the stages of generation, recombination, redistribution of nonequilibrium charge carriers in the contact field, the photoemission of electrons, formation of the photolysis products, and genesis of the PbN₆(Ab)-Pb(photolysis product)-Cd system. It was demonstrated that the diffusion of anionic vacancies to neutral Pb _n ⁰ sites is the limiting stage of the photolysis of the PbN₆(Ab)-Cd system.