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Titolo:
PHOTOBLEACHING STUDY OF LATENT-IMAGE AND SUBIMAGE CENTERS IN SULFUR AND SULFUR-PLUS-GOLD-SENSITIZED AGBR EMULSIONS - IMPLICATIONS REGARDINGTHE FUNCTIONS OF GOLD
Autore:
KAWASAKI M; YOSHIKI T; OKU Y;
Indirizzi:
KYOTO UNIV,FAC ENGN,DEPT IND CHEM KYOTO 606 JAPAN
Titolo Testata:
Journal of imaging science and technology
fascicolo: 6, volume: 37, anno: 1993,
pagine: 568 - 575
SICI:
1062-3701(1993)37:6<568:PSOLAS>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SILVER CLUSTERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
M. Kawasaki et al., "PHOTOBLEACHING STUDY OF LATENT-IMAGE AND SUBIMAGE CENTERS IN SULFUR AND SULFUR-PLUS-GOLD-SENSITIZED AGBR EMULSIONS - IMPLICATIONS REGARDINGTHE FUNCTIONS OF GOLD", Journal of imaging science and technology, 37(6), 1993, pp. 568-575

Abstract

The photographic functions of gold, as present in sulfur-plus-gold (S+ Au)-sensitized AgBr grains, have been investigated through a seriesof photoionization-induced bleaching spectra of the photolytic centers formed in S- and S + Au-sensitized emulsions. The bleaching characteristics of the S-sensitized emulsion were similar to those of a chemically unsensitized emulsion reported previously. The photolytic centersformed in S + Au-sensitized grains could hardly be photobleached unless deliberately added effective electron acceptors were present, thus indicating that they can assume a markedly high electron-capturing capability that probably relates to the high quantum yield of latent image formation. Comparison between the photobleaching thresholds of the S- and S + Au-sensitized grains suggests that the incorporation of goldatoms into the photolytic centers in the S + Au-sensitized grains depends both on their sizes and on the rates at which they are grown. There seemed to be no built-in gold atoms at the stage of the two-atom size, and rapid growth of photolytic centers under high-intensity exposures allowed formation of centers, both with and without built-in gold atoms, in the three-atom or larger size range. A possible mechanism bywhich gold atoms enter the photolytic centers is discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/01/20 alle ore 07:32:21