Energetics and dynamics of excited sensitizing dyes on silver halide surfaces

In recent years electron transfer rates have been measured from excited dye molecules of both monomeric and J-aggregate form into silver halide crysta ls over a nide range of temperatures with picosecond time resolution. From these new experimental results, one obtains definite information about the energetics, electronic coupling strengths, and dynamic parameters of the re action. These data can serve as the first basis for a detailed comparison a nd test of notions that have been advanced in the past to describe the rele vant energetics and dynamics of the primary electron injection process into silver halide grains. The comparison will be made in particular with the m odels that have been widely used in the past by the photographic community, but also with the somewhat different concepts that have been developed for other closely related physical systems.