电子在液氩中的散射和输运
Electron scattering and transport in liquid argon
摘要：
用玻尔兹曼方程的多项解和狄拉克-福克散射方程计算的从头算液相截面，重新讨论了外加电场驱动下液态氩中过剩电子的输运.液相截面的计算扩展了以前的处理，考虑多极极化率和非本地处理的交换，而电子氩势的准确性进行了验证，通过比较计算的气相截面与实验。提出的结果突出了不足的交换，通常用于液体和集群相截面计算的本地处理。考虑相干散射的多项玻尔兹曼方程框架使得能够在由相互作用和结构因子引起的微分截面中包含全部各向异性，而无需在速度分布函数中的准各向同性的先验假设。该模型不含自由参数，考虑了相干散射和液相屏蔽效应，能很好地再现实验漂移速度和特征能量。
英文摘要：
The transport of excess electrons in liquid argon driven out of equilibrium by an applied electric field is revisited using a multi-term solution of Boltzmann's equation together with ab initio liquid phase cross-sections calculated using the Dirac-Fock scattering equations. The calculation of liquid phase cross-sections extends previous treatments to consider multipole polarisabilities and a non-local treatment of exchange while the accuracy of the electron-argon potential is validated through comparison of the calculated gas phase cross-section with experiment. The results presented highlight the inadequacy of local treatments of exchange that are commonly used in liquid and cluster phase cross-section calculations. The multi-term Boltzmann equation framework accounting for coherent scattering enables the inclusion of the full anisotropy in the differential cross-section arising from the interaction and the structure factor, without an a priori assumption of quasi-isotropy in the velocity distribution function. The model, which contains no free parameters and accounts for both coherent scattering and liquid phase screening effects, was found to reproduce well the experimental drift velocities and characteristic energies.
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