Integral Cross Sections for Electron–Magnesium Scattering Over a Broad Energy Range (0–5000 eV)

Abstract

We report the results from the application of our optical potential and relativistic optical potential (ROP) methods to electron-magnesium scattering. The energy range of this study was 0-5000 eV, with the results for the integral elastic cross sections, summed discrete electronic-state excitation integral cross sections, momentum transfer cross sections, and total ionisation cross sections being reported. Where possible, we compare the present results to the available experimental data and to the earlier results from close coupling and R-matrix type computations. Typically, a quite fair level of accord is found between our ROP calculations and the earlier theoretical and experimental cross sections. Additionally, from the assembled database, we provide for the modeling community some recommended cross section sets for use in their simulations, in which magnesium is a constituent. Electron transport coefficients are subsequently calculated for reduced electric fields ranging from 0.1 to 1000 Td using a multiterm solution of Boltzmann's equation. Substantial differences in the transport coefficients between the ROP calculations and the recommended cross sections are observed over the range of fields considered, clearly illustrating the importance of the veracity of the database in the simulations.

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

“…Hence, we used Δ 5.28 eV for Be, but in the particular case of Mg instead of the lowest optically allowed excitation transition we employed Δ 2.71 eV, which corresponds to a forbidden transition which, probably due to the strong configuration mixing present in Mg, contributes notably to the emission spectrum. 23 The present OP results for positron scattering from Be are summarized in Table 1 and Fig. 1, while those for positron scattering from Mg are summarized in Table 2…”

“…[16][17][18][19][20] Note that while the polarization interaction in both the electron and positron scattering cases does act the same, due to the different charges the static interaction, in principle, remains different at all energies. We therefore also wished to investigate this effect with our OP and ROP calculations in both Be and Mg, drawing on our recent electron-Be 22 and electron-Mg 23 results in order to do so. Furthermore, and we believe this is the first time such a study has been undertaken, we intend to use our cross section data for electron and positron scattering in order to simulate their transport characteristics through background Be and Mg gases, under the influence of an applied (external) electric field, and to investigate any similarities or differences in their behavior across a range of reduced electric fields (E/n 0 , where E electric field strength and n 0 number density).…”

“…4, we formulate the recommended data for those species for total scattering, elastic scattering, positronium formation, the sum of all the discrete inelastic channels, and ionization. Using these recommended positron cross section sets, and corresponding data (where appropriate) for electron scattering, 22,23 in Sec. 5, the results from our Boltzmann equation analysis of positron and electron transport in Be and Mg are presented.…”

Joint theoretical and experimental study on elastic electron scattering from bismuth

“…We have recently described our standard optical potential approach in our studies of the electron-beryllium [34] and electron-magnesium [35] scattering systems. All the generic details of our atomic OP method, including the forms of the static potential, polarization potential, and the exchange potential, that we use, were given in those papers [34,35] and so only the key points of this method are summarized here. The electron-atom interaction is described by a local complex potential given by…”

Electron-impact excitation of the ( 5s25p ) P1/22→Hamilton1, Zatsarinny2, Bartschat3 et al. 2020Phys. Rev. ASelf Cite5090View full textAdd to dashboardCite

“…Another rationale behind this work is to try and provide benchmark data for the 5p → 6s transition in indium, against which results from other methods might be tested. This is of timely importance, as atomic optical-potential approaches, which are computationally cheaper than the present close-coupling approaches, have been gaining in popularity (see, e.g., [16][17][18]) in recent years.…”