Abstract
Photosensitive elements of photographic materials are silver halide microcrystals. As shown in Figure 1, there are many mobile interstitial silver ions in the interior, and there are sensitivity centers composed of silver gold sulfide on the surface of each microcrystal. The absorption of a photon by the microcrystal results in the formation of a free electron, which is soon trapped by a sensitivity center. Then, an interstitial silver ion reaches and reacts with the trapped electron to form a silver atom. The repetition of these electronic and ionic processes at the same center leads to the formation of a latent image, which is a cluster composed of several silver atoms and acts as the catalyst for the electrochemical reduction of the host microcrystal to form a silver or dye image during photographic development.1
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Tani, T., Mihara, Y. (1990). Infrared Photography. In: Matsuoka, M. (eds) Infrared Absorbing Dyes. Topics in Applied Chemistry. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2046-1_14
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DOI: https://doi.org/10.1007/978-1-4899-2046-1_14
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