化学增感中心促进卤化银潜影形成的理论解释

Theory of chemical sensitization center accelerating latent image formation in silver halide emulsion

针对化学增感中心的特点,采用经典近似,从理论角度分析了硫加金化学增感中心的存在有利于卤化银感光材料潜影的形成,并借助于理想模型,通过简化因子计算了硫加金增感中心的有效电荷数z(0.42)、光电子在增感中心上的停留时间τ(1.4ns)及捕获中心的半径R(0.59nm)和截面积S(1.1×10-14cm2)等相关参数。

It was analyzed,on the basis of chemical sensitization center property by classical approximation,the sulfur-plus-gold sensitization center favour to the latent-image formation during the exposure of sensitized photographic material. The related parameters of sulfur-plus-gold sensitization center, such as effective charge, the residence time of photo-electron trapped by chemical sensitization center, tapping radius and trapping cross-section were calculated based on some empirical expression.