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本文讨论了e~+云团中激发分子反应对Ps形成几率的影响,认为:(1)除了云团中的过剩电子之外,某些激发分子也可以对Ps的形成作出贡献;(2)激发分子与添加剂的反应也能影响Ps形成的几率,并且不同类型的反应(激发分子的猝灭或激发分子与添加剂分子之间发生电子转移)对Ps形成几率的影响也截然不同。根据云团反应的竞争机理,提出了Ps形成几率(三重态正子素O—Ps的几率I_3)与添加剂浓度之间的一般关系式(近似式),并用所得的关系式对一些典型的有机液体与CS_2,SF_6,C_2H_5Br,CCl_4等添加剂组成的混合体系进行了理论拟合,通过对拟合参数的分析,对一些“疑难问题”作出了明确的解释。并把添加剂的电子亲合势和激发分子的电离势等有机地联系了起来。
In this paper, we discuss the influence of the excited molecular reaction on the probability of formation of Ps in e ~ + clouds. The results show that: (1) Some excitons can contribute to the formation of Ps in addition to excess electrons in the cloud; (2) The reaction of the excitation molecule with the additive also affects the probability of Ps formation and the effect of the different types of reaction (quenching of the excitation molecule or electron transfer between the excitation molecule and the additive molecule) on the probability of formation of Ps is also quite different. According to the competition mechanism of cloud reaction, the general relation (approximate formula) between the probability of formation of Ps (the probability of O-Ps of triplet normoxins I_3) and the additive concentration was put forward, and some typical organic liquids And CS_2, SF_6, C_2H_5Br, CCl_4 additives such as mixed system consisting of a theoretical fit, through the analysis of fitting parameters, some of the “difficult problems” made a clear explanation. And the additive electronic affinity and the excitation of molecular ionization potential organically linked.