Studies have heed made on the effects of divalent metal ions (Hg
2+, Cu
2+, Pb
2+, Ni
2+, Co
2+, Cd
2+, Fe
2+, Zn
2+, Ba
2+, Sr
2+, and Mn
2+) upon photographic and emission processes in cubic silver bromide grains (ca. 0.7μ) in emulsions. Among these metal ions, only divalent mercury and copper ions, which have the most positive and the second most positive redox potentials respectively caused a marked decrease of the emission intensity of the grains in emulsions at liquid nitrogen temperature which appeared at about 600nm, with a marked decrease of photographic speeds of the emulsions.
These results suggest that the increase of photographic speeds are not caused by the electron traps provided by divalent mercury and copper ions.
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