考虑高能粒子辐照二氧化硅玻璃形成E’色心的情况,建立了E’色心形成的动力学模型,得到了E’色心浓度与辐照剂量的关系式.结果表明,在高能粒子辐照情况下,E’色心的形成包括两个过程,即色心的创造过程和色心的激活过程.色心的创造过程主要由二氧化硅网格中疲劳键的断裂形成或网格中氧移位形成,E’色心浓度随剂量的变化呈线性增长.色心的激活过程主要由二氧化硅玻璃中固有点缺陷形成,E’色心浓度随剂量的变化呈饱和趋势.理论结果和实验结果符合很好,说明建立的模型是有效的.
In this paper, a kinetic model for the radiation-induced production of the intrinsic point defect E' center is proposed. The relation of E' center concentration changing with dose is obtained. The results show that the production of E' center includes two processes, i.e. the creation of new defects and the activation of preexisting defects. The stained bonds (or oxygen replacement) in silica networks lead to the creation of new defects, whose concentration increases linearly with the dose. The preexisting defects produce the activation, which tends to saturation. The theoretical result is in good agreement with the experiment.