Lith显影的自催化性质

Lith显影与常规显影不同,在一个较宽的曝光范围内,颗粒群体的还原是平行的而不是顺序的。顺序还原时,乳剂层的密度增长速率只是给出了颗粒间显影诱导期分布的信息。只有平行还原时,密度增长速率才给出了单个乳剂颗粒还原速率的信息。换言之,只有在颗粒群体平行还原时,表现显影动力学才具有单个乳剂颗粒的显影特征:在显影诱导期结束后开始了自催化的还原阶段。Lith显影的自催化性质应该归因于颗粒群体还原的平行方式。

THE AUTOCATALYTIC NATURE OF LITH DEVELOPMENT

Different from conventional development, Lith development proceeds with parallel pattern of grain population reduction over a wider range of exposure. If sequential pattern of grain reduction occurs, the density growth only gives information about the distribution of development induction period among grains. Only when parallel pattern of grain population reduction occurs, the density growth gives information about the rate at which a single grain develops. In other words, only when all the developable grains in emulsion layer develop in parallel, the whole layer will have the same developme nt kinetics as that of a single grain and this makes the whole process autocatalytic in nature. So the autocatalytic nature of Lith development can be attributed to the parallel pattern of grain population reduction.