Electron-Impact Ionization of Heavy Atoms Using the Time-Dependent Close-Coupling Method

M S Pindzola ,S D Loch ,J Colgan

doi:10.3390/atoms9020032

M S Pindzola , S D Loch + Show 1 more

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https://doi.org/10.3390/atoms9020032

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Journal: Atoms	Publication Date: Jun 8, 2021
Citations: 1	License type: CC BY 4.0

Affiliation: Auburn University, Los Alamos National Laboratory

Abstract

The time-dependent close-coupling method has been recently applied to calculate electron-impact direct ionization cross sections for the Kr, W, and Pb atoms. An overview is presented for these three heavy neutral atom systems. When the direct ionization cross sections are combined with excitation-autoionization cross sections, the total ionization cross sections were found to be in reasonable agreement with crossed-beams measurements for Kr and Pb.

Highlights

The rest of the paper is structured as follows: in Section 2 we review the timedependent close-coupling method for the electron ionization of atoms, in Section 3 we present time-dependent close-coupling (TDCC) electron ionization cross sections for Kr, W, and Pb, and in Section 4 we give a brief summary
Both the TDCC and convergent close-coupling [9] direct ionization cross sections fall below the crossed-beams measurements [10,11], while the convergent close-coupling calculation for direct ionization ionization added to R-matrix B-spline excitation–autoionization cross sections are in excellent agreement with experiments up to an incident energy of 20 eV
In conclusion we have presented previous results for the electron-impact direct ionization of the Kr, W, and Pb atoms using the time-dependent close-coupling method

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Electron-impact direct ionization cross sections for the Kr, W, and Pb atoms have recently been calculated using the time-dependent close-coupling (TDCC) method [1,2,3]. When the TDCC direct ionization cross sections for Kr [1] are combined with distorted-wave excitation–autoionization cross sections, the total ionization cross sections are found to be in reasonable agreement with crossed-beams measurements [8]. When the direct ionization cross sections for Pb are combined with R-matrix B-spline excitation–autoionization cross sections [9], the total ionization cross sections are found to be in reasonable agreement with crossed-beams measurements [10,11] For both Kr and Pb, the non-perturbative. All quantities are given in atomic units

Theory

Results

Summary