Abstract
Abstract As described in detail in Chapter 4, photographic sensitivity is based on the formation of a latent image center on a silver halide emulsion grain as a result of its light absorption. A latent image center is a microcluster of silver atoms and is formed by the electronic and ionic processes that take place repeatedly, one after another, when photoelectrons are created as a result of the light absorption of an emulsion grain. The electronic process is the capture of a photoelectron by an electron trap, which is usually provided by chemical sensitization, as described in Chapter 6. The ionic process is the reaction of the trapped electron with an interstitial silver ion to form a silver atom in an emulsion grain.
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