Abstract
The election spin resonance spectra of two kinds of internally sensitive core–shell emulsions, with chemical structure imperfections and with physical lattice imperfections respectively, were studied in this paper. It was found thai both the internal sensitivity and the intensity of the rlecl rou spin resonance (ESR) signal increased with an increase of the chemical sensitization time to a maximum and then decreased. the ESR signal intensity decreased with a decrease of the core–shell ratio and an increase of the prefogging level. Different desensitizing dyes hud different effects on the internal photographic property and the intensity of the ESR signal because of their desensitizing mechanisms. The results tun be explained on the basis of the behaviour of the positive hole within the silver halide crystal.
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