Positron Scattering from the Group IIB Metals Zinc and Cadmium: Recommended Cross Sections and Transport Simulations

IF 4.4 2区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physical and Chemical Reference Data Pub Date : 2021-05-04 DOI:10.1063/5.0046091

P. Stokes, R. White, R. McEachran, F. Blanco, G. García, M. Brunger

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引用次数: 2

Abstract

Results from the application of our optical potential and relativistic optical potential models to positron scattering from gas-phase zinc (Zn) and cadmium (Cd) are presented. In particular, integral cross sections (ICSs) for elastic scattering, positronium formation, summed discrete electronic-state excitation, and ionization scattering processes are reported for both species and over an extended incident positron energy range. From those ICSs, the total cross section is subsequently constructed by taking their sum. We note that there are currently no experimental data available for any of these scattering processes for either species, with earlier computational results being limited to the elastic channel and restricted to relatively narrow incident positron energy regimes. Nonetheless, we construct recommended positron cross section datasets for both zinc and cadmium over the incident positron energy range of 0–10 000 eV. The recommended positron cross section data are subsequently employed in a multi-term Boltzmann equation analysis to simulate the transport of positrons, under the influence of an applied (external) electric field, through the background Zn and Cd gases. Qualitatively similar behavior in the calculated transport coefficients was observed between both species. Finally, for the case of zinc, the present positron transport coefficients are compared against corresponding results from electron transport with some significant differences now being observed.

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IIB族金属锌和镉的正电子散射：推荐截面和输运模拟

介绍了我们的光学势和相对论光学势模型在气相锌和镉正电子散射中的应用结果。特别是，在扩展的入射正电子能量范围内，报道了弹性散射、正电子形成、加和离散电子态激发和电离散射过程的积分截面（ICSs）。根据这些ICSs，随后通过取其总和来构造总横截面。我们注意到，目前还没有任何实验数据可用于这两种物质的任何散射过程，早期的计算结果仅限于弹性通道，并且仅限于相对较窄的入射正电子能量范围。尽管如此，我们构建了锌和镉在0–10入射正电子能量范围内的推荐正电子截面数据集 000eV。推荐的正电子截面数据随后被用于多项玻尔兹曼方程分析，以模拟正电子在外加（外部）电场的影响下通过背景Zn和Cd气体的传输。在计算的传输系数中，在两个物种之间观察到了定性相似的行为。最后，对于锌的情况，将目前的正电子输运系数与电子输运的相应结果进行了比较，目前正在观察到一些显著的差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Physical and Chemical Reference Data 化学-化学综合

CiteScore

6.90

自引率

11.60%

发文量

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.