INVESTIGATION OF PANCHROMATIC SENSITIZATION OF EVAPORATED FILMS OF SILVER BROMIDE.
Final rept. Apr 63-Mar 64,
FAIRCHILD SPACE AND DEFENSE SYSTEMS SYOSSET N Y
Pagination or Media Count:
The major factors controlling the evaporation of silver bromide, rate of movement of Cronar substrate past the boat, the temperature of evaporation, the shape of the boat, the distance from boat to substrate and the relative location of boat and shield are discussed in detail. A thickness of 2-3 microns for the evaporated layers appears to optimize photographic sensitivity. Electron microscopic and electron diffraction studies have shown that the evaporated silver bromide is apparently deposited as oriented crystals. The conductivity of pure and doped silver bromide is being considered as a means for evaluating the impurity levels in silver bromide. Conductivity measurements on double zone refined and annealed specimens of ultra pure silver bromide show that we have succeeded in preparing the purest silver bromide reported in the open literature. It has been demonstrated that spectral sensitization of evaporated silver bromide may be obtained if the evaporated layer is etched prior to dye adsorption. The etching agents which give reasonable results are limited in number. The synthesis of some merocyanine and cyanine dyes are also discussed. Author