照相明胶层中金催化的无电沉积的正电子湮没研究

采用正电子湮没技术（ＰＡＴ）研究了照相明胶中的自由体积空穴在无电沉积过程中的作用机理。研究结果表明，洁化饱和后，照相明胶的自由体积空；穴的平均尺寸约减小０．０１１ｎｍ＾２，相当于一个Ａｕ原子的体积的大小，即照相明胶大分子中的每个自由体积穸穴平均填充了一个Ａｕ原子，该ＡＵ原子作为催化活性核催化铜的沉积，使物理显影生成的影像为紧密铜粒子的堆积形貌，而不是丝状形貌，铜经无电沉积饱和后，照相明胶的自由体积

Studies on Electroless Deposition Catalyzed by Gold in Photographic Gelatin Layer with Positron Annihilation

The mechanism of action of free volume holes in photographic gelatin on the electroless deposition process has been studied by Positron Annihilation Technology (PAT) in this paper. The results show that after complete activation, the average volume of the free volume holes in photographic decreas- es by about 0. 011 nm3, which is equivalent to the volume of a gold atom. In the view of statistical average concept, every free volume hole is filled with a gold atom to catalyze the electroless copper deposition. Thus the imaging feature formed in the physical development is not filament, but spherical stacks. After electroless copper deposition is accomplished, the average volume of the free volume holes in photographic gelatin decreases by about 0. 020 nm3, which is equivalent to the volume of three copper atom. Therefore the deposition of copper in isotropic and spherical form was not hindered by free volume holes in photographic gelatin.