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Original Articles

About the Nature of the Sensitivity Specks Formed by Gold Sensitization and Their Function during Latent Image Formation-A Controversial SubjectFootnote

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Pages 148-155 | Received 31 Jan 1976, Published online: 22 Jul 2016
 

Abstract

Controversial viewpoints about the mechanism of gold sensitization are critically outlined. From our results and those mentioned in the literature we have tried to give an answer to the following questions: (1) Does gold sensitization influence the efficiency of photoelectron or positive hole trapping during the exposure or does it only play a role after exposure?; (2) If photoelectron or positive hole trapping is characteristic for the gold sensitization mechanism, what is the part played (a) by the nature or (b) by the distribution (dispersion) or the quantity of the sensitivity specks?; (3) What are the chemical changes produced by the reaction of the gold sensitizer on the emulsion grains?

resume

Les différents points de vue sur le mécanisme dc la sensibilisation à I’or soul présentés. A partir de nos résultats et de ceux publiés dans la littérature, nous avons essayé de répondre aux questions suivantes:

lére question: La sensibilisation à I’or influence-t-elle I’efficacité du piégeage des photoélectrons ou des trous positifs pendant I’exposition ou joue-t-elle un rôle settlement après I’exposition?

2éme question: Si le piégeage des photoélectrons et des trous positifs est une caractéristique du mécanisme de la sensibilisation à I’or, quel est le rôle joué

(a) par la nature

ou (b) par la répartition ou la quantité des germes de sensibilité?

3éme question: Quelles sont les modifications chimiques produites par la réaction de I’or sensibilisateur dans les grains dc I’émulsion?

Zusammenfassung

Kontroverse Ansichten über den Mechanismus der Goldsensibilisierung werden kritisch erbrtert. Aus den Ergebnissen eigener Arbeiten und aus der Literatur wird versucht, die folgenden Fragen zu beantworten:

Frage 1. BeeinfluBt die Goldsensibilisierung die Wirksamkeit des Photoclektronen—bzw. Defektelektroneneinfanges während der Belichtung oder spielt sie nur nach der Belichtung cine Rolle?

Frage 2: Falls Elektronen—bzw. Defektelektroneneinfang für den Mechanismus der Goldscnsibilisierung charakteristisch ist, welche Rolle spielen (a) iherer Natur nach oder (b) ihrer Verteilung (Dispersität) Oder Menge nach die Empfindlichkeitskeime?

Frage3: Welches sind die chcmischen Veriinderungen, die durch die Reaktion mit dem Goldsensibilisator an den Silberhalogenidkristallen stattfinden?

riassunto

I punti di vista controversi sul meccanismo della sensibilizzazione eon oro sono stati riesaminati criticamente. Da noslri fisultati e da quelli riportati in letteratura abbiamo tentato di dare una risposta alle seguenti domande:

Domanda n° 1; La sensibilizzazione con oro influenza I’eflicienza della cattura dei fotoelettroni o delle buche positive nel corso dell’esposizione o esca gioca soltanto un ruolo dopo I’esposizione?

Domanda n° 2: Se la cattura dei fotoelettroni o delle buche positive è caratteristica del meccanismo della sensibilizzazione con oro, fluale è il ruolo (a) della natura o (b) della distribuzione (dispersione) o della quantità dei germi di sensibilità?

Domanda n° 3: Quali sono le modificazioni chimiche provocate dalla reazione dei sensibilizzatori d’oro sui granuli dell’emulsione

Notes

Paper presented at a symposium on “Fundamental Problems in Photographic Science” organized by the Science Committee of The Royal Photographic Society on 8-13 September 1975 in Oxford, England. MS received 31 January 1976.

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