Abstract
AbstractThe electron transfer theory of Marcus is used for the investigation of the interaction between chemical and spectral sensitization. For this purpose cyanine dyes, which vary in redox potential over a long range, are adsorbed on silver chloride and silver bromide in unripened, reduction and sulphur-ripened states. Using ESRspectroscopy and sensitometric methods the efficiency of electron transfer, as well as the photographic response as a function of dye concentration and ripening state, were investigated. For all dyes the reaction enthalpy for electron transfer from the excited dye to the silver halide, and for the reduction of the excited dye by donors tram the silver halide, were calculated. There is a qualitative discussion of the rate constant for electron transfer between dye and silver halide.
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