Journal article

Publication year: 2019

Journal: Physical review A

Volume number: 100

Issue number: 1

ISSN: 2469-9926

eISSN: 2469-9934

Open access status: Hybrid

DOI Link: https://doi.org/10.1103/PhysRevA.100.012707

Publisher: American Physical Society

Abstract: 
We investigate electron-impact single ionization of He-like ions of charge state q = 0, . . . , 6 in the initial ground (1 S-1) and metastable (2( 3)S) states. Good agreement between theory and experiment is established for the total cross sections, and then the scaling behavior with q is considered as a function of the ratio u = E-i/E-I <= 10 of the incident electron energy E-i and the ionization threshold E-I. While the expected E-I(2) scaling of the cross sections is confirmed, we also find that at each scaled energy u the spin asymmetry (for the 2 S-3 state) converges rapidly to a nonzero constant with increasing q. This indicates that, despite E-I increasing with q(2), exchange effects remain undiminished on the broad scaled-energy range considered. We suggest that this physical behavior is more universal than just for the He-like ions.

Harvard Citation style: Bray, I., Fursa, D., Kadyrov, A., Müller, A., Borovik, A. and Schippers, S. (2019) Spin asymmetry in electron-impact ionization, Physical review A, 100(1), Article 012707. https://doi.org/10.1103/PhysRevA.100.012707

APA Citation style: Bray, I., Fursa, D., Kadyrov, A., Müller, A., Borovik, A., & Schippers, S. (2019). Spin asymmetry in electron-impact ionization. Physical review A. 100(1), Article 012707. https://doi.org/10.1103/PhysRevA.100.012707