气相铍和镁的正电子散射:理论、推荐截面和输运模拟

IF 4.4 2区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
F. Blanco, G. Garcia, R. McEachran, P. Stokes, R. White, M. Brunger
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引用次数: 4

摘要

介绍了我们的光学势和相对论光学势模型在气相铍(Be)和镁(Mg)正电子散射中的应用结果。具体而言,在扩展的入射正电子能量范围内,报道了两种物质的弹性、正电子形成、离散电子态激发和电离散射过程的总截面和积分截面。在可能的情况下,将这些结果与现有的理论和实验数据进行比较,尽管这里必须注意的是,be还没有可用的电流测量值,而Mg的可用电流测量值在很大程度上局限于总截面。尽管如此,在该比较的基础上,形成了上述所有横截面的推荐横截面数据集。这些推荐的横截面数据随后被用于玻尔兹曼方程分析,以模拟正电子在外加(外部)电场的影响下通过背景Be和Mg气体的传输。请注意,还报道了弹性动量传递截面的相对论光学势结果,使我们能够在输运模拟中考虑各向异性效应。最后,我们对电离率系数、通量和体漂移速度等量的正电子模拟结果与相应的电子输运结果进行了比较,观察到显著差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Positron Scattering from Gas-Phase Beryllium and Magnesium: Theory, Recommended Cross Sections, and Transport Simulations
Results from the application of our optical potential and relativistic optical potential models to positron scattering from gas-phase beryllium (Be) and magnesium (Mg) are presented. Specifically, total cross sections and integral cross sections for the elastic, positronium formation, summed discrete electronic-state excitation, and ionization scattering processes are reported for both species and over an extended incident positron energy range. Where possible, these results are compared against the existing theoretical and experimental data, although it must be noted here that no current measurements are yet available for Be and those that are available for Mg are largely restricted to the total cross section. Nonetheless, on the basis of that comparison, recommended cross section datasets, for all the aforementioned cross sections, are formed. Those recommended cross section data are subsequently employed in a Boltzmann equation analysis to simulate the transport of positrons, under the influence of an applied (external) electric field, through the background Be and Mg gases. Note that relativistic optical potential results for the elastic momentum transfer cross section are also reported, to allow us to account for anisotropy effects in our transport simulations. Finally, our positron simulation results for quantities such as the ionization rate coefficients and flux and bulk drift velocities are compared with the corresponding electron transport results with significant differences being observed.
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来源期刊
CiteScore
6.90
自引率
11.60%
发文量
14
审稿时长
>12 weeks
期刊介绍: The Journal of Physical and Chemical Reference Data (JPCRD) is published by AIP Publishing for the U.S. Department of Commerce National Institute of Standards and Technology (NIST). The journal provides critically evaluated physical and chemical property data, fully documented as to the original sources and the criteria used for evaluation, preferably with uncertainty analysis. Critical reviews may also be included if they document a reference database, review the data situation in a field, review reference-quality measurement techniques, or review data evaluation methods.
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