https://doi.org/10.1140/epjd/s10053-022-00413-7
Regular Article – Atomic and Molecular Collisions
Electron-impact excitation of the 5
and 5
transitions in rubidium by 40 eV electrons: theory and experiment
1
Department of Physics and Astronomy, Drake University, 50311, Des Moines, IA, USA
2
Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080, Belgrade, Serbia
3
Faculty of Natural Sciences, University of Banja Luka, 78000, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4
College of Science and Engineering, Flinders University, GPO Box 2100, 5001, Adelaide, SA, Australia
5
Institute of Actuarial Science and Data Analytics, UCSI University, 56000, Kuala Lumpur, Malaysia
g
Michael.Brunger@flinders.edu.au
Received:
17
March
2022
Accepted:
29
April
2022
Published online:
20
May
2022
We report on a series of detailed Breit-Pauli and Dirac B-spline R-matrix (DBSR) differential cross section (DCS) calculations for excitation of the 
and 
states in rubidium by 40 eV incident electrons. The early BP computations shown here were carried out with both 5 states and 12 states, while the DBSR models coupled 150 and 325 states, respectively. We also report corresponding results from a limited set of DCS measurements on the unresolved 
states, with the experimental data being restricted to the scattered electron angular range 2–
. Typically, good agreement is found between our calculated and measured DCS for excitation of the unresolved states, with best accord being found between the DBSR predictions and the measured data. The present theoretical and experimental results are also compared with predictions from earlier 40 eV calculations using the nonrelativistic Distorted-Wave Born Approximation and a Relativistic Distorted-Wave model.
© The Author(s) 2022. corrected publication 2022
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
