Abstract
Observations on single crystals of AgBr exposed to long-wavelength visible or near-infrared radiation in the presence of applied electric fields show that the Herschel bleaching of latent-image centers at room temperature is caused by destruction of silver centers by photoemission of electrons. Silver can be regenerated at other sites by recombination of the liberated electrons with silver ions. Brominated crystals of AgBr exhibit an action spectrum for the production of mobile positive holes, unaccompanied by mobile electrons, extending from the edge of the intrinsic absorption band to about wavelength 630 mμ, attributed to photoliberation of deeply trapped holes.
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