1999 Volume 62 Issue 3 Pages 196-208
Crystal-face selectivity of latent image centers formed on sulfur-sensitized AgBr grains was determined by means of arrested development. The location of latent image centers didn't essentially change, even if cyanine dyes and 4-hydroxy-6-methyl-1, 3, 3a, 7-tetraazaindene (TAI) were added to AgBr grains after sulfur sensitization. When silver halide grains were sulfur-sensitized in the presence of cyanine dyes with adsorption preference to specific crystal face, latent image centers were mostly formed on the faces to which the dyes did not adsorb preferencially. When silver halide grains were sulfursensitized in the presence of TAI, latent image centers were preferentially formed on their {100} faces. The amount of silver sulfide formed was measured by use of radio-active 35S-labeled sulfur sensitizers. Silver sulfide was formed even on AgBr grain surface to which cyanine dyes and TAI were adsorbed. I proposed the following mechanism for the location control of latent image centers by use of cyanine dyes and TAI. Though silver sulfide molecules were formed even on the faces to which cyanine dyes and TAI were adsorbed, their growth to sensitization centers was prohibited by the cyanine dyes and TAI. On the other hand, effective sulfur-sensitization centers were formed on the faces to which the cyanine dyes and TAI were not adsorbed.
