scholarly journals Cross Sections and Rate Coefficients for Vibrational Excitation of HeH+ Molecule by Electron Impact

Atoms ◽  
2016 ◽  
Vol 4 (4) ◽  
pp. 30 ◽  
Author(s):  
Mehdi Ayouz ◽  
Viatcheslav Kokoouline
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Rate Coefficients

scholarly journals Cross Sections and Rate Coefficients for Vibrational Excitation of H2O by Electron Impact

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 62
Author(s):  
Mehdi Ayouz ◽  
Alexandre Faure ◽  
Jonathan Tennyson ◽  
Maria Tudorovskaya ◽  
Viatcheslav Kokoouline
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Normal Modes ◽  
Scattering Matrix ◽  
Rate Coefficients ◽  
Vibrational States ◽  
R Matrix ◽  
Frame Transformation ◽  
The Uk

Cross-sections and thermally averaged rate coefficients for vibration (de-)excitation of a water molecule by electron impact are computed; one and two quanta excitations are considered for all three normal modes. The calculations use a theoretical approach that combines the normal mode approximation for vibrational states of water, a vibrational frame transformation employed to evaluate the scattering matrix for vibrational transitions and the UK molecular R-matrix code. The interval of applicability of the rate coefficients is from 10 to 10,000 K. A comprehensive set of calculations is performed to assess uncertainty of the obtained data. The results should help in modelling non-LTE spectra of water in various astrophysical environments.

Cross sections for resonant vibrational excitation ofN2by electron impact

1981 ◽  
Vol 23 (3) ◽  
pp. 1089-1099 ◽  
Author(s):  
A. U. Hazi ◽  
T. N. Rescigno ◽  
M. Kurilla
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Vibrational Excitation

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.

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