Accession Number : AD0746294

Title :   New Model Systems for Research on Photographic Sensitivity.

Descriptive Note : Final rept. Jun 69-Apr 72,

Corporate Author : VIRGINIA UNIV CHARLOTTESVILLE DEPT OF PHYSICS

Personal Author(s) : Mitchell,J. W. ; Hada,H.

Report Date : JUN 1972

Pagination or Media Count : 98

Abstract : Two new model systems have been developed for research on photographic sensitivity with crystals of silver chloride, bromide, chlorobromides and bromoidides. Thin square tabular crystals with sides of several hundred microns have been grown from aqueous solvent mixtures, saturated with the silver halides, and containing ethylamine, monoethanolamine, pyridine, and ammonium hydroxide. Such crystals can be produced over the whole range of silver chlorobromide compositions and with up to 5 mol% silver iodide in silver bromide. Epitaxial overgrowths of silver chloride, silver bromide, and of silver chlorobromides and bromoidides have been produced on melt-grown silver chloride, silver chlorobromide and silver bromide substrates, from saturated solutions of the halides in monoethanolamine-water mixtures. The distribution of the internal latent image and of internal photolytic sensitivity with both types of overgrowth has been studied. The microcrystals and both types of overgrowth have been chemically sensitized and optically sensitized for the formation of a surface latent image, which is revealed by either chemical or physical development. With these two new model systems, it should be possible to resolve a considerable number of outstanding problems in photographic sensitivity. (Author)

Descriptors :   (*SILVER COMPOUNDS, *PHOTOSENSITIVITY), (*PHOTOGRAPHIC IMAGES, SILVER COMPOUNDS), (*CRYSTAL GROWTH, SILVER COMPOUNDS), HALIDES, BROMIDES, IODIDES, CHLORIDES, EPITAXIAL GROWTH, SINGLE CRYSTALS, ORGANIC SOLVENTS, AMINES, SOLUTIONS(MIXTURES), THIOSULFATES, DYES, GELS

Subject Categories : Printing and Graphic Arts
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE