The study of elementary steps of the photolysis of silver halides by the method of microwave photoconductivity

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• 作者：G. F. Novikov ; E. V. Rabenok and M. V. Alfimov
• 刊名：High Energy Chemistry
• 出版年：2005
• 出版时间：May 2005
• 年：2005
• 卷：39
• 期：3
• 页码：167-174
• 全文大小：93 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3148

文摘

The major part of inconsistencies in the description of the mechanism of formation of nonhalide silver clusters under exposure to light is due to the lack of quantitative data on electronic-ionic processes in microdispersed silver halide systems. The use of the microwave photoconductivity technique partially fills the gap. The drift mobility of holes and electrons in powdered AgBr (0.8 and 60 cm2 V–1 s–1, respectively) and of electrons in powdered AgCl (40 cm2 V–1 s–1) and the rate constants of the recombination of localized electrons and free holes in powder AgBr (1.4 × 10–7 cm3 s–1) and of free electrons and holes in AgBr and AgCl (1.5 ± 0.5) × 10–11 and 2 × 10–12 cm3 s– 1, respectively) were determined. The range of the depth of traps formed by treatment with aqueous solutions of sodium thiosulfate in AgCl (0.45–0.63 eV) and by preliminary exposure of AgCl and AgBr grains (0.4 and 0.25–0.36 eV, respectively) was estimated. The rate constant of the hole capture by the centers formed by introducing AgI (7 × 10–9 cm3 s–1) was determined, and the lifetime of the Ag atom (10–4 s) was estimated. The paper summarizes the results obtained.