描述液态烃中多余电子复合动力学的扩散概念的有效性

I.A. Boriyev, B.S. Yakovlev
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引用次数: 1

摘要

对室温下液态烃中电离辐射产生的电子的受体分子捕获效率(Hummel理论中的α系数)的实验值和计算值进行了比较;戊烷,正己烷,异辛烷和新戊烷。为了实验测定α值,作者使用了在碳氢化合物中芘溶液(1015 ~ 1016 cm−3)中由快电子脉冲引起的发光测量。计算电子复合过程的扩散描述的α值是基于以下关系式:α≈KSrm3/u,其中KS是芘分子捕获电子的速率常数;U为电子的漂移迁移率;Rm是电子最可能的热裂解距离。通过研究快电子脉冲在芘溶液中的电导率,测定了十五烷和新戊烷的KS和u值;在正己烷和异辛烷的情况下,KS和u以及rm使用了已发表的数据。结果表明,对于电子迁移率相对较低的碳氢化合物,α的计算值与实验值一致,而对于电子迁移率最高的碳氢化合物(新戊烷),使用扩散概念计算时,α的值被高估了。
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The validity of diffusion concepts for describing the kinetics of recombination of an excess electron in liquid hydrocarbons

A comparison has been made of the experimental and calculated relative values of the efficiency of capture by the acceptor molecule of an electron generated by ionizing radiations (the α coefficient in Hummel's theory) in liquid hydrocarbons at room temperature; pentadecane, n-hexane, iso-octane and neopentane. For the experimental determination of the values of α the authors used the measurements of luminescence induced by a pulse of fast electrons in solutions of pyrene (1015−1016 cm−3) in hydrocarbons. Calculation of the values of α for the diffusion description of the process of recombination of an electron is based on the relation: αKSrm3/u, where KS is the rate constant of capture of an electron by the molecule of pyrene; u is the drift mobility of the electron; rm is the most probable distance of thermolysation of an electron. The values of KS and u for pentadecane and neopentane were determined by investigation of the electrical conductivity induced by a pulse of fast electrons in solutions of pyrene; for KS and u in the case of n-hexane and iso-octane and also for rm the published data were used. It is shown that while for hydrocarbons with relatively low mobility of the electron the calculated and experimental values of α agree, for the hydrocarbon with the highest mobility of the electron (neopentane) use of diffusion concepts for the calculation gives an overstated value of α.

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