Calculation of electron-impact excitation and ionization of atoms and ions

1996 ◽  
Vol 74 (11-12) ◽  
pp. 875-882 ◽  
Author(s):  
Igor Bray
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Coupling Method ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Ionization Cross ◽  
Close Coupling ◽  
Spin Asymmetries ◽  
Total Ionization ◽  
Ionization Cross Sections

We present a review of applications of the convergent close-coupling method concentrating on spin-dependent electron-impact total ionization cross sections. The results for the electron-impact total ionization cross sections and the associated spin asymmetries of H, Li, O5+, Na, and He(23S) are reviewed, with new calculations being presented for the potassium target.

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

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 32
Author(s):  
Michael S. Pindzola ◽  
Stuart D. Loch ◽  
James P. Colgan
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Coupling Method ◽  
Time Dependent ◽  
Ionization Cross ◽  
Close Coupling ◽  
Direct Ionization ◽  
Total Ionization ◽  
Ionization Cross Sections

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.

scholarly journals Electron-impact double ionization of the carbon atom

2018 ◽  
Vol 620 ◽  
pp. A188 ◽  
Author(s):  
Valdas Jonauskas
Keyword(s):  
Carbon Atom ◽  
Electron Impact ◽  
Cross Sections ◽  
Double Ionization ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation ◽  
Ionization Cross ◽  
Ionization Cross Sections ◽  
Good Agreement

Electron-impact single- and double-ionization cross sections and Maxwellian rate coefficients are presented for the carbon atom. Scaling factors are introduced for the electron-impact excitation and ionization cross sections obtained in the distorted wave (DW) approximation. It is shown that the scaled DW cross sections provide good agreement with measurements for the single ionization of the C atom and C1+ ion. The direct double-ionization (DDI) process is studied using a multi-step approach. Ionization–ionization, excitation–ionization–ionization, and ionization–excitation–ionization branches are analyzed. It is demonstrated that the three-step processes contribute ≼40% of the total DDI cross sections for the case where one of the electrons takes all of the excess energy after the first ionization process.

Relativistic R-matrix close-coupling method based on the effective many-body Hamiltonian: electron-impact excitation of the 3s2 1S0–3s3p1P1o electric dipole-allowed transition of the Ar6+ ion1This article is part of a Special Issue on the 10th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas.

2011 ◽  
Vol 89 (4) ◽  
pp. 457-463
Author(s):  
Juan A. Santana ◽  
Yasuyuki Ishikawa
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Electric Dipole ◽  
Coupling Method ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Many Body ◽  
Close Coupling ◽  
R Matrix ◽  
Excitation Cross Sections

Electron-impact excitation cross sections of the electric dipole-allowed 3s2 1S0–3s3p [Formula: see text] transition in Mg-like argon (Ar6+) are calculated using the configuration-interaction and effective many-body Hamiltonian R-matrix close-coupling methods. The near-threshold electron-impact excitation cross sections computed with the effective many-body Hamiltonian R-matrix close-coupling method are in good agreement with the benchmark experimental results.

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