| Issue |
A&A
Volume 620, December 2018
|
|
|---|---|---|
| Article Number | A188 | |
| Number of page(s) | 6 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361/201834303 | |
| Published online | 14 December 2018 | |
Electron-impact double ionization of the carbon atom⋆
Institute of Theoretical Physics and Astronomy Vilnius University, Saulėtekio Av. 3, 10257
Vilnius, Lithuania
e-mail: valdas.jonauskas@tfai.vu.lt
Received:
22
September
2018
Accepted:
28
October
2018
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.
Key words: atomic data / atomic processes
Tables 1–12 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/620/A188
© ESO 2018
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