Dependence of Light-induced ESR Spectra of Dyes Adsorbed by AgBr Emulsion Grains upon Emulsion Factors

Abstract

Some sensitizing dyes adsorbed by octahedral AgBr emulsion grains (-0.7μ) exhibited structureless light-induced ESR signals at g=2, 005. The highest occupied electronic energy level of the dye which could show the ESR signal is estimated to be higher by more than 0.3 eV than the top of valence band of AgBr. The signal intersity was decreased by halogen acceptors, by incorporating iodide into AgBr, by evacuation, and by sulfur sensitization. These results suggest that the observed ESR signal resulted from dye positive holes.