Dissociation and Ionization Cross Sections and Rate Coefficients of Air Molecules by Electron Impact: the Role of Vibrational Energy

2006 ◽  
Author(s):  
Annarita Laricchiuta ◽  
Mario Capitelli ◽  
Roberto Celiberto ◽  
Gianpiero Colonna
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Vibrational Energy ◽  
Rate Coefficients ◽  
Ionization Cross ◽  
Ionization Cross Sections

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.

scholarly journals Electron-impact ionization of Fe8+

2019 ◽  
Vol 624 ◽  
pp. A14 ◽  
Author(s):  
Aušra Kynienė ◽  
Sigitas Kučas ◽  
Šarūnas Masys ◽  
Valdas Jonauskas
Keyword(s):  
Electron Impact ◽  
Quantum Number ◽  
Cross Sections ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Rate Coefficients ◽  
Ionization Cross ◽  
Ionization Cross Sections ◽  
Best Fit ◽  
Extended Basis

Electron-impact ionization cross sections and Maxwellian rate coefficients are presented for the Fe8+ion by considering processes from the ground and metastable levels. The lifetimes of the levels for the 3s23p53d configuration were analysed using the extended basis of interacting configurations. Convergence of the cross sections for the indirect process due to excitations to the high-nlsubshells was investigated. We demonstrate that excitations to the subshells with orbital quantum numberl = 3 with subsequent autoionization dominate up to electron energies of ∼700 eV for the ground and metastable levels. Modelling of theoretical cross sections obtained for the ground and metastable levels to produce the best fit to the measurements shows that 15% of ions reach the reaction zone in the metastable state. The obtained results contradict the previous work that showed ∼30% for the metastable fraction.

scholarly journals Single-Photon Multiple Detachment in Fullerene Negative Ions: Absolute Ionization Cross Sections and the Role of the Extra Electron

2013 ◽  
Vol 111 (4) ◽  
Author(s):  
R. C. Bilodeau ◽  
N. D. Gibson ◽  
C. W. Walter ◽  
D. A. Esteves-Macaluso ◽  
S. Schippers ◽  
...  
Keyword(s):  
Cross Sections ◽  
Single Photon ◽  
Negative Ions ◽  
Ionization Cross ◽  
Extra Electron ◽  
Ionization Cross Sections
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