Collision strengths and rate coefficients for electron impact excitation in He I: an extrapolation of R-matrix calculations to higher electron impact energies

1993 ◽  
Vol 264 (2) ◽  
pp. 402-410 ◽  
Author(s):  
A. C. Lanzafame ◽  
J. A. Tully ◽  
K. A. Berrington ◽  
P. L. Dufton ◽  
P. B. Byrne ◽  
...  
Keyword(s):  
Electron Impact ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation ◽  
R Matrix ◽  
Impact Energies

Electron impact excitation of Al XIII : Collision strengths and rate coefficients

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-309-Pr2-312
Author(s):  
K. M. Aggarwal ◽  
F. P. Keenan ◽  
S. J. Rose
Keyword(s):  
Electron Impact ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact Excitation

Rate coefficients for electron impact excitation of N2

2015 ◽  
Vol 463 ◽  
pp. 38-46 ◽  
Author(s):  
M. Vojnović ◽  
M. Popović ◽  
M.M. Ristić ◽  
M.D. Vićić ◽  
G.B. Poparić
Keyword(s):  
Electron Impact ◽  
Impact Excitation ◽  
Rate Coefficients ◽  
Electron Impact 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.

scholarly journals R-matrix electron-impact excitation data for astrophysically abundant sulphur ions

2011 ◽  
Vol 533 ◽  
pp. A87 ◽  
Author(s):  
G. Y. Liang ◽  
N. R. Badnell ◽  
G. Zhao ◽  
J. Y. Zhong ◽  
F. L. Wang
Keyword(s):  
Electron Impact ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
R Matrix
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