Electron recombination in ionized liquid argon: a computational approach based on realistic models of electron transport and reactions.
Electron recombination in ionized liquid argon: a computational approach based on realistic models of electron transport and reactions.
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电离液氩中的电子重组：一种基于电子传输和反应的现实模型的计算方法。
DOI：
10.1021/jp201149w
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
M. Wojcik
中科院分区：
文献类型：
--
作者：
M. Jaskolski;M. Wojcik
在这项工作中，我们提出了一个新的理论方法来模拟在87 K液态氩电离径迹中的电子-离子复合过程。我们开发了一种计算机模拟方法，使用现实模型的电荷传输和电子-离子反应。通过在径迹中引入一维周期性的概念，我们能够模拟带电粒子的非常大的圆柱形结构。我们应用我们的模拟方法来计算电子的逃逸概率作为初始电离密度的函数在轨道。对于较高电离密度的辐射径迹，计算结果与实验定量一致。在低电离密度下，模拟结果略微高估了实验数据。我们讨论了这种分歧的可能原因，并得出结论，它可以解释的δ轨道（二次电子的短轨道）在电子-离子复合过程中的作用。我们引入了一个近似模型，考虑到δ轨道的存在，并允许从液氩电离检测器获得的实验数据在很宽的电离密度范围内再现。
In this work, we propose a new theoretical approach to modeling the electron-ion recombination processes in ionization tracks in liquid argon at 87 K. We developed a computer simulation method using realistic models of charge transport and electron-ion reactions. By introducing the concept of one-dimensional periodicity in the track, we are able to model very large cylindrical structures of charged particles. We apply our simulation method to calculate the electron escape probability as a function of the initial ionization density in the track. The results are in quantitative agreement with experiment for radiation tracks of relatively high ionization density. At low ionization densities, the simulation results slightly overestimate the experimental data. We discuss possible reasons for this disagreement and conclude that it can be explained by the role of δ tracks (short tracks of secondary electrons) in electron-ion recombination processes. We introduce an approximate model that takes into account the presence of δ tracks and allows the experimental data obtained from a liquid-argon ionization detector to be reproduced over a wide range of ionization density.