This investigation expands on previous photographic studies of the sensitivity of sulfur and sulfur-plus-gold sensitized octahedral AgBr emulsions to long wavelength light. The experimental atmosphere was controlled by a variable temperature vacuum sensitometer which reduced the oxygen and moisture content of emulsion coatings and thereby improved the efficiency of long wavelength sensitivity. The relative sensitivity at long wavelengths was determined as a function of wavelength, sensitizer level, and sensitizer type. The activation energy actually measures the energy for a hole release from an excited sensitizer center and not for an electron release as earlier work has claimed. By correlating the desensitization by 02 with the measured energy levels, a thermal trap depth of electrons trapped at sensitizer centers was derived.
Library of Congress Subject Headings
Photographic emulsions; Photographic sensitometry
Zhang, Dan, "Electronic properties of sensitizer centers" (1992). Thesis. Rochester Institute of Technology. Accessed from
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