用PAT研究银丝生成机理  

PAT Study of Development Process

作　　者：马爱慧[1] 张宜恒[1] 杨保忠[1,1] 徐绪国[1] 闫天堂[1] 杨保忠 

机构地区：[1]中国科学技术大学,合肥230026

出　　处：《信息记录材料》2000年第1期25-27,68,共4页Information Recording Materials

基　　金：国家自然科学基金

摘　　要：采用电子湮没技术 (PAT)测定常规溴化银乳剂的正电子湮没寿命谱 ,用量子力学方法计算了自由体积空穴的变化 ,从而探讨银丝的生长机理。结果表明 ,用 D- 19作显影液 ,溴化银晶体先溶解后被还原 ,物理显影占据非常重要的地位 ,生成的银沿着电子密度较高的方向生长。In this paper,the lifetime spectrum of coventional AgBr emulsion was determined by Positron Annihilation Technique(PAT） .The changes of free volume holes was calcualted by Quantum Mechanics method,and the mechanism has been proposed to account for the formation of silver thread in development process.The results showed that AgBr crystal was dissolved before restored in D- 19 deve- loping solution.In the whole development,physical development is very important.The silver ion was reduced to silver atom in the space of the different electron cloud density ,therefor the production and deposition of silver atom occur in filamentary form.

关 键 词：银线 显影 定影 PAT 溴化银乳剂 化学增感 

分 类 号：TQ571.6[化学工程—精细化工] TQ575