Positron Scattering from Gas-Phase Beryllium and Magnesium: Theory, Recommended Cross Sections, and Transport Simulations

被引:8
作者
Blanco, F. [1 ,2 ]
Garcia, G. [3 ]
McEachran, R. P. [4 ]
Stokes, P. W. [5 ]
White, R. D. [5 ]
Brunger, M. J. [6 ]
机构
[1] Univ Complutense Madrid, Dept Estructura Mat Fis Term & Elect, Plaza Ciencias 1, E-28040 Madrid, Spain
[2] Univ Complutense Madrid, IPARCOS, Plaza Ciencias 1, E-28040 Madrid, Spain
[3] CSIC, Inst Fis Fundamental, Serrano 113 Bis, E-28006 Madrid, Spain
[4] Australian Natl Univ, RSPE, Plasma Res Lab, Canberra, ACT 0200, Australia
[5] James Cook Univ, Coll Sci & Engn, Townsville, Qld 4810, Australia
[6] Flinders Univ S Australia, Coll Sci & Engn, GPO Box 2100, Adelaide, SA 5001, Australia
基金
澳大利亚研究理事会;
关键词
beryllium; magnesium; positron scattering cross sections; positron transport; recommended cross sections; OPTICAL-POTENTIAL APPROACH; NOBLE-GASES; ELECTRON; HYDROGEN; ALKALI;
D O I
10.1063/1.5115353
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页数:19
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