Abstract

Different concentrations of potassium thiocyanate (SCN) were used in combination with Iridium (III) hexachloride (Ir) to surface sensitize an octahedral silver bromide emulsion. Surface sensitivity increased by 0.90 log H over the unsensitized emulsion when Ir and SCN were added during sensitization compared to 0.45 log H when the iridium salt was used alone. A decrease of 2.40 log H was observed when an Ir-SCN complex was formed and then added to the emulsion. An increase of 1.05 log H was obtained if gold, thiocyanate and iridium were used. Similar results were obtained using tetramethylthiourea (TMT) or thiodiglycol (TG) instead of SCN. The emulsion was sensitized with S+Au and Au+SCN for comparison. The mechanism of iridium sensitization is discussed based on the experimental results.

Library of Congress Subject Headings

Photographic sensitometry; Silver halide crystals; Iridium; Ligands

Publication Date

2-4-1987

Document Type

Thesis

Student Type

Graduate

Degree Name

Imaging Science (MS)

Advisor

Judith Harbison

Advisor/Committee Member

Paul Gilman Jr

Advisor/Committee Member

Harry Roberts

Comments

Physical copy available from RIT's Wallace Library at TR280.Z84 1987

Campus

RIT – Main Campus

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