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Titolo:
QUANTITATIVE STUDY OF PHOTOHOLE-INDUCED BLEACHING OF LATENT IMAGE CENTERS IN AGBR EMULSIONS
Autore:
OKU Y; KAWASAKI M;
Indirizzi:
KYOTO UNIV,GRAD SCH ENGN,DIV MOL ENGN YOSHIDA KYOTO 60601 JAPAN
Titolo Testata:
Journal of imaging science and technology
fascicolo: 6, volume: 40, anno: 1996,
pagine: 582 - 590
SICI:
1062-3701(1996)40:6<582:QSOPBO>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTOLYTIC SILVER CLUSTERS; SUBIMAGE CENTERS; POSITIVE HOLES; SENSITIZATION; SULFUR; MICROCRYSTALS; DIFFUSION; GOLD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
Y. Oku e M. Kawasaki, "QUANTITATIVE STUDY OF PHOTOHOLE-INDUCED BLEACHING OF LATENT IMAGE CENTERS IN AGBR EMULSIONS", Journal of imaging science and technology, 40(6), 1996, pp. 582-590

Abstract

The photohole-induced bleaching of latent image and subimage centers in AgBr emulsions in the intrinsic absorption region has been studied quantitatively by using phenosafranine dye as an effective photoelectron scavenger. The quantum bleaching efficiencies of the minimum latentimage centers in our standard development condition were thus estimated to be typically similar to 0.8 x 10(-3)(1 x 10(-3)), -3 x 10(-3) (3x 10(3)), and similar to 5 x 10(-3) (4 x 10(-3)), respectively, for primitive, S-sensitized, and S + Au-sensitized emulsions consisting of 0.4 - 0.53-mu m cubic (0.55-mu m octahedral) grains. A much higher quantum bleaching efficiency of similar to 1 x 10(-2) was measured for what we identified with a two-atom subimage center. The hole-induced bleaching efficiency measured in this way correlates well but inversely with the energy gap between the highest occupied level of the center tobe bleached and the valence band edge that can be derived from the corresponding photoionization threshold independently measured elsewhere. The observed energy-gap dependence suggests that the quantum bleaching efficiency is controlled kinetically by hole capture cross section that increases with decreasing hole-trapping depth, as expected for nonradiative, multiphonon processes. The present study also provides additional evidence to support that S + Au-sensitized grains allow latentimage centers both with and without built-in gold atoms to form underhigh-intensity exposure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 06:37:19