INFLUENCE OF HABIT OF SILVER-HALIDE CRYSTALS ON ABSORPTION-SPECTRA OF ADSORBED SENSITIZING DYES .3. CHLOROBROMIDE EMULSIONS

The consequences of modifications in the ratio between chloride and bromide in the crystal lattice for the absorption spectrum of cyanines were investigated in crystals with a left brace 100 right brace as well as with a left brace 111 right brace habit. Sensitizing agents with a spectrum dependent upon the crystal habit and with a J-maximum at high chloride content of the cubic emulsion crystals, whereon they are adsorbed, lose their tendency toward aggregation, when 20-40% of bromide has been built in into the lattice. The J-aggregates of dyes adsorbed to octahedral grains with high bromide content can shift to H-aggregates with increasing chloride/bromide ratio in the grains. The results are discussed in the line of existing models.