溴化银内敏乳剂灰化中心形成过程的研究

doi:10.7517/j.issn.1674-0475.1992.01.33

影像科学与光化学 ›› 1992, Vol. 10 ›› Issue (1): 33-38.DOI: 10.7517/j.issn.1674-0475.1992.01.33

溴化银内敏乳剂灰化中心形成过程的研究

符玉华, 周本茂, 季素雪, 任新民

中国科学院感光化学研究所, 北京 100101

收稿日期:1990-04-04 修回日期:1991-08-28 出版日期:1992-02-20 发布日期:1992-02-20
通讯作者: 符玉华

INVESTIGATION OF THE FORMING PROCESS OF FOGGING CENTERS IN THE AgBr EMULSION

Fu YU-HUA, ZHOU BEN-MAO, JI SU-XUE, REN XIN-MIN

Institute of Photographic Chemistry, Academic Sinica, Beijing 100101, P. R. China

Received:1990-04-04 Revised:1991-08-28 Online:1992-02-20 Published:1992-02-20

摘要/Abstract

摘要： 制备铱内敏乳剂时,乳剂颗粒表面和内部都生成了灰化中心,并且灰化中心优先在颗粒内部生成。实验结果表明,灰化剂分子可能与乳剂颗粒表面的Ag⁺作用生成单个的Ag原子,随后这些单个的Ag原子分解成Ag⁺和电子,电子进入卤化银晶体的导带。因此,可以得出这样的结论:灰化剂分子提供的电子象光电子一样进入了卤化银晶体的导带,电子进入导带后,容易被敏化中心或晶体缺陷捕获而形成灰化中心。

关键词: 敏化中心, 灰化剂, 灰化中心

Abstract: Cubic silver bromide emulsions which were sensitized internally with (NH₄)₂ IrCl₆ + K₂PtCl₅, (NH₄)₃ IrCl₆, and Na₂S₂O₃, respectively, were prepared. The emulsions were fogged by thiourea dioxide. It was found that fogging centers were formed in the interior of emulsion grain and grain surface, and fogging centers were formed preferentially in the interior of emulsion grain. It is suggested that fogging agent molecules collided with silver ions on the grain surface forming single isolated silver atom, which subsequently loses electrons to the conduction band of the crystal. Therefore, it is conclused that electron of fogging agent molecules are transfered to conduction band of silver halide crystal such as photo-electron in the conduction band of tht crystal, electrons of conduction band are trapped by sensitivity centers and lattice disorder forming fogging centers.

Key words: sensitivity center, fogging agent, fogging center

符玉华, 周本茂, 季素雪, 任新民. 溴化银内敏乳剂灰化中心形成过程的研究[J]. 影像科学与光化学, 1992, 10(1): 33-38.

Fu YU-HUA, ZHOU BEN-MAO, JI SU-XUE, REN XIN-MIN. INVESTIGATION OF THE FORMING PROCESS OF FOGGING CENTERS IN THE AgBr EMULSION[J]. Imaging Science and Photochemistry, 1992, 10(1): 33-38.

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溴化银内敏乳剂灰化中心形成过程的研究

INVESTIGATION OF THE FORMING PROCESS OF FOGGING CENTERS IN THE AgBr EMULSION

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